United States Gasoline Fund (UGA) 10-K26 Mar 152014 FY Annual reportFinancial data

Company Profile

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
Document And Entity Information (USD $)	Dec. 31, 2014	Mar. 23, 2015	Jun. 30, 2014
Document Information [Line Items]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Registrant Name	United States Gasoline Fund, LP
Entity Central Index Key	1396878
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float			$44,128,000
Trading Symbol	UGA
Entity Common Stock, Shares Outstanding		2,600,000

Statements_of_Financial_Condit

Statements of Financial Condition (USD $)	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents (Notes 2 and 5)	$35,557,290	$52,193,157
Equity in trading accounts:
Cash and cash equivalents	6,161,581	2,053,484
Unrealized gain (loss) on open commodity futures contracts	-2,835,302	2,598,553
Receivable for shares sold	1,689,272	0
Receivable from General Partner (Note 3)	134,106	137,776
Dividends receivable	968	628
Directors' fees and insurance receivable	673	258
Prepaid registration fees	124,693	171,146
ETF transaction fees receivable	350	0
Total assets	40,833,631	57,155,002
Liabilities and Partners' Capital
General Partner management fees payable (Note 3)	22,444	28,519
Professional fees payable	125,122	225,429
Brokerage commissions payable	1,973	1,723
License fees payable	1,948	2,160
Total liabilities	151,487	257,831
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital
General Partner	0	0
Limited Partners	40,682,144	56,897,171
Total Partners' Capital	40,682,144	56,897,171
Total liabilities and partners' capital	$40,833,631	$57,155,002
Limited Partners' shares outstanding	1,200,000	950,000
Net asset value per share	$33.90	$59.89
Market value per share	$34.15	$59.93

Schedule_of_Investments

Schedule of Investments (United States, USD $)	Dec. 31, 2014		Dec. 31, 2013
Open Cleared Swap and Futures Contracts \| Open Futures Contracts, Long \| NYMEX RBOB Gasoline Futures RB February 2015 contracts, expiring January 2015
Number of contracts	658	[1]
Unrealized Gain (Loss) on Open Commodity Contracts	($2,835,302)	[1]
% of Partners' Capital	-6.97%	[1]
Open Cleared Swap and Futures Contracts \| Open Futures Contracts, Long \| NYMEX RBOB Gasoline Futures RB February 2014 contracts, expiring January 2014
Number of contracts			486	[2]
Unrealized Gain (Loss) on Open Commodity Contracts			2,598,553	[2]
% of Partners' Capital			4.57%	[2]
Cash Equivalents
Market Value	34,023,594		48,493,330
% of Partners' Capital	83.63%		85.23%
Cash Equivalents \| US Treasury Securities
Market Value	5,999,245
% of Partners' Capital	14.75%
Cash Equivalents \| US Treasury Securities \| US Treasury Bill Securities
Principal Amount	3,000,000		10,000,000
Market Value	2,999,790		9,998,347
% of Partners' Capital	7.38%		17.57%
Cash Equivalents \| US Treasury Securities \| US Treasury Bill Securities One
Principal Amount	3,000,000
Market Value	2,999,455
% of Partners' Capital	7.37%
Cash Equivalents \| Money Market Funds
Market Value			38,494,983
% of Partners' Capital			67.66%
Cash Equivalents \| Money Market Funds \| Fidelity Institutional Government Portfolio, Class I
Principal Amount			16,063,515
Market Value			16,063,515
% of Partners' Capital			28.23%
Cash Equivalents \| Money Market Funds \| Goldman Sachs Financial Square Funds Government Fund, Class FS
Principal Amount			9,407,119
Market Value			9,407,119
% of Partners' Capital			16.54%
Cash Equivalents \| Money Market Funds \| Morgan Stanley Institutional Liquidity Funds, Government Portfolio
Principal Amount	28,024,349		13,024,349
Market Value	$28,024,349		$13,024,349
% of Partners' Capital	68.88%		22.89%

[1]	Collateral amounted to $6,161,581 on open futures contracts.
[2]	Collateral amounted to $2,053,484 on open futures contracts.

Schedule_of_Investments_Parent

Schedule of Investments (Parenthetical) (USD $)	12 Months Ended
Schedule of Investments (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument, Collateral Amount	6,161,581	2,053,484
United States \| NYMEX RBOB Gasoline Futures RB February 2015 contracts, expiring January 2015 \| Open Cleared Swap and Futures Contracts \| Open Futures Contracts, Long
Expiration date	Jan-15
United States \| NYMEX RBOB Gasoline Futures RB February 2014 contracts, expiring January 2014 \| Open Cleared Swap and Futures Contracts \| Open Futures Contracts, Long
Expiration date		Jan-14
United States \| US Treasury Bill Securities \| US Treasury Securities \| Cash Equivalents
Interest rate	0.05%	0.07%
Expiration date	2/26/15	3/27/14
United States \| US Treasury Bill Securities One \| US Treasury Securities \| Cash Equivalents
Interest rate	0.06%
Expiration date	4/30/15

Statements_of_Operations

Statements of Operations (USD $)	12 Months Ended
Statements of Operations (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions	($21,284,156)	$3,496,995	$17,063,315
Change in unrealized gain (loss) on open positions	-5,433,855	-9,790	-2,121,382
Dividend income	8,021	9,198	14,372
Interest income	5,271	5,281	11,635
ETF transaction fees	6,650	5,600	12,250
Total income	-26,698,069	3,507,284	14,980,190
Expenses
General Partner management fees (Note 3)	294,290	351,177	550,046
Professional fees	185,801	225,429	275,643
Brokerage commissions	38,600	39,110	63,245
Directors' fees and insurance	12,396	13,365	18,888
License fees	7,357	8,779	13,751
Registration fees	46,454	46,453	20,911
Total expenses	584,898	684,313	942,484
Expense waiver (Note 3)	-182,226	-137,776	-139,446
Net expenses	402,672	546,537	803,038
Net income (loss)	($27,100,741)	$2,960,747	$14,177,152
Net income (loss) per limited partnership share	($25.99)	$1.50	$10.02
Net income (loss) per weighted average limited partnership share	($30.23)	$2.97	$8.47
Weighted average limited partnership shares outstanding	896,438	997,123	1,672,951

Statements_of_Changes_in_Partn

Statements of Changes in Partners' Capital (USD $)	Total	General Partner	Limited Partners
Begining Balances at Dec. 31, 2011	$77,387,098	$0	$77,387,098
Net asset value, beginning of year at Dec. 31, 2011	$48.37
Addition of partnership shares	87,043,567	0	87,043,567
Redemption of partnership shares	-114,382,329	0	-114,382,329
Net income/loss	14,177,152	0	14,177,152
Ending Balances at Dec. 31, 2012	64,225,488	0	64,225,488
Net asset value, end of year at Dec. 31, 2012	$58.39
Addition of partnership shares	19,597,900	0	19,597,900
Redemption of partnership shares	-29,886,964	0	-29,886,964
Net income/loss	2,960,747	0	2,960,747
Ending Balances at Dec. 31, 2013	56,897,171	0	56,897,171
Net asset value, end of year at Dec. 31, 2013	$59.89
Addition of partnership shares	30,932,639	0	30,932,639
Redemption of partnership shares	-20,046,925	0	-20,046,925
Net income/loss	-27,100,741	0	-27,100,741
Ending Balances at Dec. 31, 2014	$40,682,144	$0	$40,682,144
Net asset value, end of year at Dec. 31, 2014	$33.90

Statements_of_Changes_in_Partn1

Statements of Changes in Partners' Capital (Parenthetical)	12 Months Ended
Statements of Changes in Partners' Capital (Parenthetical)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Addition of partnership units, units	600,000	350,000	1,550,000
Redemption of partnership units, units	350,000	500,000	2,050,000

Statements_of_Cash_Flows

Statements of Cash Flows (USD $)	12 Months Ended
Statements of Cash Flows (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Net income (loss)	($27,100,741)	$2,960,747	$14,177,152
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
(Increase) decrease in commodity futures trading account - cash and cash equivalents	-4,108,097	3,116,655	-708,465
Unrealized (gain) loss on futures contracts	5,433,855	9,790	2,121,382
(Increase) decrease in receivable from General Partner	3,670	1,670	-35,393
(Increase) decrease in dividends receivable	-340	771	-707
(Increase) decrease in interest receivable	0	0	26
(Increase) decrease in directors' fees and insurance receivable	-415	1,028	-966
(Increase) decrease in prepaid registration fees	46,453	46,453	20,913
(Increase) decrease in ETF transaction fees receivable	-350	0	0
Increase (decrease) in investment payable	0	0	-33
Increase (decrease) in General Partner management fees payable	-6,075	-4,341	-5,775
Increase (decrease) in professional fees payable	-100,307	-50,214	35,885
Increase (decrease) in brokerage commissions payable	250	-625	-967
Increase (decrease) in license fees payable	-212	-326	-1,049
Net cash provided by (used in) operating activities	-25,832,309	6,081,608	15,602,003
Cash Flows from Financing Activities:
Addition of partnership shares	29,243,367	19,597,900	87,043,567
Redemption of partnership shares	-20,046,925	-29,886,964	-114,382,329
Net cash provided by (used in) financing activities	9,196,442	-10,289,064	-27,338,762
Net Increase (Decrease) in Cash and Cash Equivalents	-16,635,867	-4,207,456	-11,736,759
Cash and Cash Equivalents, beginning of year	52,193,157	56,400,613	68,137,372
Cash and Cash Equivalents, end of year	$35,557,290	$52,193,157	$56,400,613

Organization_and_Business

Organization and Business	12 Months Ended
Organization and Business	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Business	NOTE 1 - ORGANIZATION AND BUSINESS

	The United States Gasoline Fund, LP (“UGA”) was organized as a limited partnership under the laws of the state of Delaware on April 13, 2007. UGA is a commodity pool that issues limited partnership shares (“shares”) that may be purchased and sold on the NYSE Arca, Inc. (the “NYSE Arca”). Prior to November 25, 2008, UGA’s shares traded on the American Stock Exchange (the “AMEX”). UGA will continue in perpetuity, unless terminated sooner upon the occurrence of one or more events as described in its Second Amended and Restated Agreement of Limited Partnership dated as of March 1, 2013 (the “LP Agreement”). The investment objective of UGA is for the daily changes in percentage terms of its shares’ per share net asset value (“NAV”) to reflect the daily changes in percentage terms of the spot price of gasoline (also known as reformulated gasoline blendstock for oxygen blending, or “RBOB”, for delivery to the New York harbor), as measured by the daily changes in the price of the futures contract for gasoline traded on the New York Mercantile Exchange (the “NYMEX”) that is the near month contract to expire, except when the near month contract is within two weeks of expiration, in which case the futures contract will be the next month contract to expire (the “Benchmark Futures Contract”), less UGA’s expenses. It is not the intent of UGA to be operated in a fashion such that the per share NAV will equal, in dollar terms, the spot price of gasoline or any particular futures contract based on gasoline. It is not the intent of UGA to be operated in a fashion such that its per share NAV will reflect the percentage change of the price of any particular futures contract as measured over a time period greater than one day. United States Commodity Funds LLC (“USCF”), the general partner of UGA, believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in Futures Contracts (as defined below) and Other Gasoline-Related Investments (as defined below). UGA accomplishes its objective through investments in futures contracts for gasoline, crude oil, natural gas, diesel-heating oil and other petroleum-based fuels that are traded on the NYMEX, ICE Futures or other U.S. and foreign exchanges (collectively, “Futures Contracts”) and other gasoline-related investments such as cash-settled options on Futures Contracts, forward contracts for gasoline, cleared swap contracts and over-the-counter transactions that are based on the price of gasoline, crude oil and other petroleum-based fuels, Futures Contracts and indices based on the foregoing (collectively, “Other Gasoline-Related Investments”). As of December 31, 2014, UGA held 658 Futures Contracts for gasoline traded on the NYMEX and did not hold any Futures Contracts traded on ICE Futures.

	UGA commenced investment operations on February 26, 2008 and has a fiscal year ending on December 31. USCF is responsible for the management of UGA. USCF is a member of the National Futures Association (the “NFA”) and became a commodity pool operator registered with the Commodity Futures Trading Commission (the “CFTC”) effective December 1, 2005. USCF is also the general partner of the United States Oil Fund, LP (“USO”), the United States Natural Gas Fund, LP (“UNG”), the United States 12 Month Oil Fund, LP (“USL”) and the United States Diesel-Heating Oil Fund, LP (“UHN”), which listed their limited partnership shares on the AMEX under the ticker symbols “USO” on April 10, 2006, “UNG” on April 18, 2007, “USL” on December 6, 2007 and “UHN” on April 9, 2008, respectively. As a result of the acquisition of the AMEX by NYSE Euronext, each of USO’s, UNG’s, USL’s and UHN’s shares commenced trading on the NYSE Arca on November 25, 2008. USCF is also the general partner of the United States Short Oil Fund, LP (“DNO”), the United States 12 Month Natural Gas Fund, LP (“UNL”) and the United States Brent Oil Fund, LP (“BNO”), which listed their limited partnership shares on the NYSE Arca under the ticker symbols “DNO” on September 24, 2009, “UNL” on November 18, 2009 and “BNO” on June 2, 2010, respectively. USCF is also the sponsor of the United States Commodity Index Fund (“USCI”), the United States Copper Index Fund (“CPER”), the United States Agriculture Index Fund (“USAG”) and the United States Metals Index Fund (“USMI”), each a series of the United States Commodity Index Funds Trust. USCI, CPER, USAG and USMI listed their shares on the NYSE Arca under the ticker symbol “USCI” on August 10, 2010, “CPER” on November 15, 2011, “USAG” on April 13, 2012 and “USMI” on June 19, 2012, respectively. On January 30, 2015, USCF as the sponsor of United States Commodity Index Funds Trust (the “Trust”) and its series USMI announced that its officers and members had authorized a plan to (i) liquidate USMI, (ii) terminate the continuous offering of USMI, and (iii) deregister USMI under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and therefore, terminate the Trust’s obligation to include USMI on its periodic and current reports with the Securities and Exchange Commission (“SEC”). USCF has submitted written notice to the NYSE Arca of its decision to liquidate USMI, terminate the offering and to terminate USMI’s obligations under the Exchange Act.

	USCF intends to file a post-effective amendment on behalf of the Trust and USMI to terminate the offering of the registered and unsold shares of USMI. The NYSE Arca will file a Form 25 with the SEC to affect the withdrawal of the listing of USMI from the NYSE Arca. Delisting from the NYSE Arca will become effective 10 days after the filing date of the Form 25. Provided that USMI continues to meet the applicable legal requirements, USCF intends to file a Form 15 on behalf of the Trust and USMI with the SEC in early April 2015 to suspend the Trust’s duty to include USMI on its reports under Sections 13(a) and 15(d) of the Exchange Act. USMI expects the termination of registration will become effective 90 days after the date of the filing of the Form 15 with the SEC. All funds listed previously are referred to collectively herein as the “Related Public Funds.”

	UGA issues shares to certain Authorized Participants (“Authorized Participants”) by offering baskets consisting of 50,000 shares (“Creation Baskets”) through ALPS Distributors, Inc., as the marketing agent (the “Marketing Agent”). The purchase price for a Creation Basket is based upon the NAV of a share calculated shortly after the close of the core trading session on the NYSE Arca on the day the order to create the basket is properly received.

	From July 1, 2011 through December 31, 2014 (and continuing at least through April 30, 2015), the applicable transaction fee paid by Authorized Participants is $350 to UGA for each order they place to create or redeem one or more baskets (“Redemption Baskets”); prior to July 1, 2011, this fee was $1,000. Shares may be purchased or sold on a nationally recognized securities exchange in smaller increments than a Creation Basket or Redemption Basket. Shares purchased or sold on a nationally recognized securities exchange are not purchased or sold at the per share NAV of UGA but rather at market prices quoted on such exchange.

	In November 2007, UGA initially registered 30,000,000 shares on Form S-1 with the SEC. On February 26, 2008, UGA listed its shares on the AMEX under the ticker symbol “UGA”. On that day, UGA established its initial per share NAV by setting the price at $50.00 and issued 300,000 shares in exchange for $15,000,000. UGA also commenced investment operations on February 26, 2008, by purchasing Futures Contracts traded on the NYMEX based on gasoline. As of December 31, 2014, UGA had registered a total of 80,000,000 shares.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

	Revenue Recognition

	Commodity futures contracts, forward contracts, physical commodities, and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the statements of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the financial statements. Changes in the unrealized gains or losses between periods are reflected in the statements of operations. UGA earns interest on its assets denominated in U.S. dollars on deposit with the FCM at the 90-day Treasury bill rate. In addition, UGA earns income on funds held at the custodian or FCM at prevailing market rates earned on such investments.

	Brokerage Commissions

	Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis.

	Income Taxes

	UGA is not subject to federal income taxes; each partner reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return.

	In accordance with accounting principles generally accepted in the United States of America (“GAAP”), UGA is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. UGA files an income tax return in the U.S. federal jurisdiction, and may file income tax returns in various U.S. states. UGA is not subject to income tax return examinations by major taxing authorities for years before 2011. The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in UGA recording a tax liability that reduces net assets. However, UGA’s conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analysis of and changes to tax laws, regulations and interpretations thereof. UGA recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the year ended December 31, 2014.

	Creations and Redemptions

	Authorized Participants may purchase Creation Baskets or redeem Redemption Baskets only in blocks of 50,000 shares at a price equal to the NAV of the shares calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed.

	UGA receives or pays the proceeds from shares sold or redeemed within three business days after the trade date of the purchase or redemption. The amounts due from Authorized Participants are reflected in UGA’s statements of financial condition as receivable for shares sold, and amounts payable to Authorized Participants upon redemption are reflected as payable for shares redeemed.

	Partnership Capital and Allocation of Partnership Income and Losses

	Profit or loss shall be allocated among the partners of UGA in proportion to the number of shares each partner holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the LP Agreement.

	Calculation of Per Share Net Asset Value (“NAV”)

	UGA’s per share NAV is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing that amount by the total number of shares outstanding. UGA uses the closing price for the contracts on the relevant exchange on that day to determine the value of contracts held on such exchange.

	Net Income (Loss) Per Share

	Net income (loss) per share is the difference between the per share NAV at the beginning of each period and at the end of each period. The weighted average number of shares outstanding was computed for purposes of disclosing net income (loss) per weighted average share. The weighted average shares are equal to the number of shares outstanding at the end of the period, adjusted proportionately for shares added and redeemed based on the amount of time the shares were outstanding during such period. There were no shares held by USCF at December 31, 2014.

	Offering Costs

	Offering costs incurred in connection with the registration of additional shares after the initial registration of shares are borne by UGA. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. These costs are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted.

	Cash Equivalents

	Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of six months or less.

	Reclassification

	Certain amounts in the accompanying financial statements were reclassified to conform to the current presentation.

	Use of Estimates

	The preparation of financial statements in conformity with GAAP requires USCF to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

Fees_Paid_By_The_Fund_And_Rela

Fees Paid By The Fund And Related Party Transactions	12 Months Ended
Fees Paid By The Fund And Related Party Transactions	Dec. 31, 2014
Fees Paid and Related Party Transactions Disclosure [Abstract]
Fees Paid By The Fund And Related Party Transactions	NOTE 3 - FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS

	USCF Management Fee

	Under the LP Agreement, USCF is responsible for investing the assets of UGA in accordance with the objectives and policies of UGA. In addition, USCF has arranged for one or more third parties to provide administrative, custody, accounting, transfer agency and other necessary services to UGA. For these services, UGA is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.60% per annum of average daily total net assets.

	Ongoing Registration Fees and Other Offering Expenses

	UGA pays all costs and expenses associated with the ongoing registration of its shares subsequent to the initial offering. These costs include registration or other fees paid to regulatory agencies in connection with the offer and sale of shares, and all legal, accounting, printing and other expenses associated with such offer and sale. For the years ended December 31, 2014, 2013 and 2012, UGA incurred $46,454, $46,453 and $20,911, respectively, in registration fees and other offering expenses.

	Directors’ Fees and Expenses

	UGA is responsible for paying its portion of the directors’ and officers’ liability insurance for UGA and the Related Public Funds and the fees and expenses of the independent directors who also serve as audit committee members of UGA and the Related Public Funds. UGA shares the fees and expenses on a pro rata basis with each Related Public Fund, as described above, based on the relative assets of each fund computed on a daily basis. These fees and expenses for the year ended December 31, 2014 were $567,863 for UGA and the Related Public Funds. UGA’s portion of such fees and expenses for the year ended December 31, 2014 was $12,396. For the year ended December 31, 2013, these fees and expenses were $555,465 for UGA and the Related Public Funds. UGA’s portion of such fees and expenses for the year ended December 31, 2013 was $13,365. For the year ended December 31, 2012, these fees and expenses were $540,586 for UGA and the Related Public Funds. UGA’s portion of such fees and expenses for the year ended December 31, 2012 was $18,888. UGA is responsible for paying its portion of any payments that may become due to the independent directors pursuant to the deferred compensation agreements entered into between the independent directors, USCF, UGA, and the Related Public Funds, except USCI, CPER, USAG and USMI.

	Licensing Fees

	UGA and the Related Public Funds, other than BNO, USCI, CPER, USAG and USMI, pay a licensing fee that is equal to 0.015% on all net assets. During the years ended December 31, 2014, 2013 and 2012, UGA incurred $7,357, $8,779 and $13,751, respectively, under this arrangement.

	Investor Tax Reporting Cost

	The fees and expenses associated with UGA’s audit expenses and tax accounting and reporting requirements are paid by UGA. These costs were approximately $164,000, $225,000 and $225,000, respectively, for the years ended December 31, 2014, 2013 and 2012.

	Other Expenses and Fees and Expense Waivers

	In addition to the fees described above, UGA pays all brokerage fees and other expenses in connection with the operation of UGA, excluding costs and expenses paid by USCF as outlined in Note 4 below. USCF has voluntarily agreed to pay certain expenses typically borne by UGA, to the extent that such expenses exceeded 0.15% (15 basis points) of UGA’s NAV, on an annualized basis, through at least June 30, 2015. USCF has no obligation to continue such payments into subsequent periods. For the year ended December 31, 2014, USCF waived $182,226 of UGA’s expenses. This voluntary expense waiver is in addition to those amounts USCF is contractually obligated to pay as described in Note 4 – Contracts and Agreements below.

Contracts_and_Agreements

Contracts and Agreements	12 Months Ended
Contracts and Agreements	Dec. 31, 2014
Contractors [Abstract]
Contracts and Agreements	NOTE 4 - CONTRACTS AND AGREEMENTS

	UGA is party to a marketing agent agreement, dated as of February 15, 2008, as amended from time to time, with the Marketing Agent and USCF, whereby the Marketing Agent provides certain marketing services for UGA as outlined in the agreement. The fee of the Marketing Agent, which is borne by USCF, is equal to 0.06% on UGA’s assets up to $3 billion; and 0.04% on UGA’s assets in excess of $3 billion. In no event may the aggregate compensation paid to the Marketing Agent and any affiliate of USCF for distribution related services exceed ten percent (10%) of the gross proceeds of UGA’s offering.

	The above fee does not include website construction and development, which are also borne by USCF.

	UGA is also party to a custodian agreement, dated January 16, 2008, as amended from time to time, with Brown Brothers Harriman & Co. (“BBH&Co.”) and USCF, whereby BBH&Co. holds investments on behalf of UGA. USCF pays the fees of the custodian, which are determined by the parties from time to time. In addition, UGA is party to an administrative agency agreement, dated February 7, 2008, as amended from time to time, with USCF and BBH&Co., whereby BBH&Co. acts as the administrative agent, transfer agent and registrar for UGA. USCF also pays the fees of BBH&Co. for its services under such agreement and such fees are determined by the parties from time to time.

	Currently, USCF pays BBH&Co. for its services, in the foregoing capacities, a minimum amount of $75,000 annually for its custody, fund accounting and fund administration services rendered to UGA and each of the Related Public Funds, as well as a $20,000 annual fee for its transfer agency services. In addition, USCF pays BBH&Co. an asset-based charge of (a) 0.06% for the first $500 million of the Related Public Funds’ combined net assets, (b) 0.0465% for the Related Public Funds’ combined net assets greater than $500 million but less than $1 billion, and (c) 0.035% once the Related Public Funds’ combined net assets exceed $1 billion. The annual minimum amount will not apply if the asset-based charge for all accounts in the aggregate exceeds $75,000. USCF also pays transaction fees ranging from $7 to $15 per transaction.

	On October 8, 2013, UGA entered into a brokerage agreement with RBC Capital Markets, LLC (“RBC Capital” or “RBC”) to serve as UGA’s futures commission merchant (“FCM”), effective October 10, 2013. Prior to October 10, 2013, the FCM was UBS Securities LLC (“UBS Securities”). The agreements require RBC Capital and UBS Securities to provide services to UGA in connection with the purchase and sale of Futures Contracts and Other Gasoline-Related Investments that may be purchased and sold by or through RBC Capital and/or UBS Securities for UGA’s account. In accordance with each agreement, RBC Capital and UBS Securities charge UGA commissions of approximately $7 to $15 per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts. Such fees include those incurred when purchasing Futures Contracts and options on Futures Contracts when UGA issues shares as a result of a Creation Basket, as well as fees incurred when selling Futures Contracts and options on Futures Contracts when UGA redeems shares as a result of a Redemption Basket. Such fees are also incurred when Futures Contracts and options on Futures Contracts are purchased or redeemed for the purpose of rebalancing the portfolio. UGA also incurs commissions to brokers for the purchase and sale of Futures Contracts, Other Gasoline-Related Investments or short-term obligations of the United States of two years or less (“Treasuries”).

		For the Year Ended			For the Year Ended			For the Year Ended
		December 31, 2014			December 31, 2013			December 31, 2012
	Total commissions accrued to brokers	$	38,600		$	39,110		$	63,245
	Annualized yield based on average daily total net assets		0.03	%		0.02	%		0.04	%
	Commissions accrued as a result of rebalancing	$	37,129		$	37,932		$	58,167
	Percentage of commissions accrued as a result of rebalancing		96.19	%		96.99	%		91.97	%
	Commissions accrued as a result of creation and redemption activity	$	1,471		$	1,178		$	5,078
	Percentage of commissions accrued as a result of creation and redemption activity		3.81	%		3.01	%		8.03	%

	UGA’s total commissions accrued to brokers for December 31, 2014, compared to the year ended December 31, 2013, were similar; and were also similar for the year ended December 31, 2013, compared to December 31, 2012, as measured by total net assets. Total commissions as an annualized percentage of average total net assets for the year ended December 31, 2014, compared to the year ended December 31, 2013, was similar; and was similar for the year ended December 31, 2013, compared to December 31, 2012, as measured by total net assets. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters.

	UGA and the NYMEX entered into a licensing agreement on April 10, 2006, as amended on October 20, 2011, whereby UGA was granted a non-exclusive license to use certain of the NYMEX’s settlement prices and service marks. Under the licensing agreement, UGA and the Related Public Funds, other than BNO, USCI, CPER, USAG and USMI, pay the NYMEX an asset-based fee for the license, the terms of which are described in Note 3. UGA expressly disclaims any association with the NYMEX or endorsement of UGA by the NYMEX and acknowledges that “NYMEX” and “New York Mercantile Exchange” are registered trademarks of the NYMEX.

Financial_Instruments_OffBalan

Financial Instruments, Off-Balance Sheet Risks and Contingencies	12 Months Ended
	Dec. 31, 2014
Disclosure Of Fair Value Off Balance Sheet Risks [Abstract]
Financial Instruments, Off-Balance Sheet Risks and Contingencies	NOTE 5 - FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES

	UGA engages in the trading of futures contracts, options on futures contracts and cleared swaps (collectively, “derivatives”). UGA is exposed to both market risk, which is the risk arising from changes in the market value of the contracts, and credit risk, which is the risk of failure by another party to perform according to the terms of a contract.

	UGA may enter into futures contracts, options on futures contracts and cleared swaps to gain exposure to changes in the value of an underlying commodity. A futures contract obligates the seller to deliver (and the purchaser to accept) the future delivery of a specified quantity and type of a commodity at a specified time and place. Some futures contracts may call for physical delivery of the asset, while others are settled in cash. The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity or by making an offsetting sale or purchase of an identical futures contract on the same or linked exchange before the designated date of delivery.

	Cleared swaps are over-the-counter agreements that are eligible to be cleared by a clearinghouse, but are not traded on an exchange. A cleared swap is created when the parties to an off-exchange over-the-counter swap transaction agree to extinguish their OTC contract and replace with a cleared swap. Cleared swaps are intended to provide the efficiencies and benefits that centralized clearing or an exchange offers to traders of futures contracts, including credit risk intermediation and the ability to offset positions initiated with different counterparties.

	The purchase and sale of futures contracts, options on futures contracts and cleared swaps require margin deposits with a FCM. Additional deposits may be necessary for any loss on contract value. The Commodity Exchange Act requires a FCM to segregate all customer transactions and assets from the FCM’s proprietary activities.

	Futures contracts and cleared swaps involve, to varying degrees, elements of market risk (specifically commodity price risk) and exposure to loss in excess of the amount of variation margin. The face or contract amounts reflect the extent of the total exposure UGA has in the particular classes of instruments. Additional risks associated with the use of futures contracts are an imperfect correlation between movements in the price of the futures contracts and the market value of the underlying securities and the possibility of an illiquid market for a futures contract. Buying and selling options on futures contracts exposes investors to the risks of purchasing or selling futures contracts.

	All of the futures contracts held by UGA were exchange-traded through December 31, 2014. The risks associated with exchange-traded contracts are generally perceived to be less than those associated with over-the-counter transactions since, in over-the-counter transactions, a party must rely solely on the credit of its respective individual counterparties. When UGA enters into non-exchange traded contracts (including Exchange for Risk or EFR transactions), it is subject to the credit risk associated with counterparty non-performance. The credit risk from counterparty non-performance associated with such instruments is the net unrealized gain, if any, on the transaction. UGA has credit risk under its futures contracts since the sole counterparty to all domestic and foreign futures contracts is the clearinghouse for the exchange on which the relevant contracts are traded. In addition, UGA bears the risk of financial failure by the clearing broker.

	UGA’s cash and other property, such as Treasuries, deposited with a FCM are considered commingled with all other customer funds, subject to the FCM’s segregation requirements. In the event of a FCM’s insolvency, recovery may be limited to a pro rata share of segregated funds available. It is possible that the recovered amount could be less than the total of cash and other property deposited. The insolvency of a FCM could result in the complete loss of UGA’s assets posted with that FCM; however, the majority of UGA’s assets are held in investments in Treasuries, cash and/or cash equivalents with UGA’s custodian and would not be impacted by the insolvency of a FCM. The failure or insolvency of UGA’s custodian, however, could result in a substantial loss of UGA’s assets.

	USCF invests a portion of UGA’s cash in money market funds that seek to maintain a stable per share NAV. UGA is exposed to any risk of loss associated with an investment in such money market funds. As of December 31, 2014 and December 31, 2013, UGA held investments in money market funds in the amounts of $28,024,349 and $38,494,983, respectively. UGA also holds cash deposits with its custodian. Pursuant to a written agreement with BBH&Co., uninvested overnight cash balances are swept to offshore branches of U.S. regulated and domiciled banks located in Toronto, Canada, London, United Kingdom, Grand Cayman, Cayman Islands and Nassau, Bahamas, which are subject to U.S. regulation and regulatory oversight. As of December 31, 2014 and December 31, 2013, UGA held cash deposits and investments in Treasuries in the amounts of $13,694,522 and $15,751,658, respectively, with the custodian and FCM. Some or all of these amounts may be subject to loss should UGA’s custodian and/or FCM cease operations.

	For derivatives, risks arise from changes in the market value of the contracts. Theoretically, UGA is exposed to market risk equal to the value of futures contracts purchased and unlimited liability on such contracts sold short. As both a buyer and a seller of options, UGA pays or receives a premium at the outset and then bears the risk of unfavorable changes in the price of the contract underlying the option.

	UGA’s policy is to continuously monitor its exposure to market and counterparty risk through the use of a variety of financial, position and credit exposure reporting controls and procedures. In addition, UGA has a policy of requiring review of the credit standing of each broker or counterparty with which it conducts business.

	The financial instruments held by UGA are reported in its statements of financial condition at market or fair value, or at carrying amounts that approximate fair value, because of their highly liquid nature and short-term maturity.

Financial_Highlights

Financial Highlights	12 Months Ended
Financial Highlights	Dec. 31, 2014
Supplemental Financial In Formation Disclosure [Abstract]
Financial Highlights	NOTE 6 – FINANCIAL HIGHLIGHTS

	The following table presents per share performance data and other supplemental financial data for the years ended December 31, 2014, 2013 and 2012. This information has been derived from information presented in the financial statements.

		Year ended			Year ended			Year ended
		December 31, 2014			December 31, 2013			December 31, 2012
	Per Share Operating Performance:

	Net asset value, beginning of year	$	59.89		$	58.39		$	48.37
	Total income (loss)		-25.54			2.05			10.5
	Net expenses		-0.45			-0.55			-0.48
	Net increase (decrease) in net asset value		-25.99			1.5			10.02
	Net asset value, end of year	$	33.9		$	59.89		$	58.39

	Total Return		-43.4	%		2.57	%		20.72	%

	Ratios to Average Net Assets
	Total income (loss)		-54.43	%		5.99	%		16.34	%
	Management fees		0.6	%		0.6	%		0.6	%
	Total expenses excluding management fees		0.59	%		0.57	%		0.43	%
	Expenses waived		-0.37	%		-0.24	%		-0.15	%
	Net expenses excluding management fees		0.22	%		0.33	%		0.28	%
	Net income (loss)		-55.25	%		5.06	%		15.46	%

	Total returns are calculated based on the change in value during the period. An individual shareholder’s total return and ratio may vary from the above total returns and ratios based on the timing of contributions to and withdrawals from UGA.

Quarterly_Financial_Data_Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
Quarterly Financial Data (Unaudited)	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data	NOTE 7 – QUARTERLY FINANCIAL DATA (Unaudited)

	The following summarized (unaudited) quarterly financial information presents the results of operations and other data for three-month periods ended March 31, June 30, September 30 and December 31, 2014 and 2013.

		First Quarter		Second Quarter		Third Quarter		Fourth Quarter
		2014		2014		2014		2014
	Total income (loss)	$	-787,140	$	3,249,642	$	-6,561,635	$	-22,598,936
	Total expenses		141,716		129,964		154,487		158,731
	Expense waivers		-16,274		-21,363		-78,559		-66,030
	Net expenses		125,442		108,601		75,928		92,701
	Net income (loss)	$	-912,582	$	3,141,041	$	-6,637,563	$	-22,691,637
	Net income (loss) per share	$	-0.89	$	4.02	$	-8.61	$	-20.51

		First Quarter		Second Quarter		Third Quarter		Fourth Quarter
		2013		2013		2013		2013
	Total income (loss)	$	3,872,304	$	-6,924,190	$	2,797,327	$	3,761,843
	Total expenses		188,826		183,346		165,565		146,576
	Expense waivers		-44,756		-46,652		-30,338		-16,030
	Net expenses		144,070		136,694		135,227		130,546
	Net income (loss)	$	3,728,234	$	-7,060,884	$	2,662,100	$	3,631,297
	Net income (loss) per share	$	3.18	$	-7.25	$	1.87	$	3.7

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

NOTE 8 – FAIR VALUE OF FINANCIAL INSTRUMENTS

UGA values its investments in accordance with Accounting Standards Codification 820 – Fair Value Measurements and Disclosures (“ASC 820”). ASC 820 defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurement. The changes to past practice resulting from the application of ASC 820 relate to the definition of fair value, the methods used to measure fair value, and the expanded disclosures about fair value measurement. ASC 820 establishes a fair value hierarchy that distinguishes between: (1) market participant assumptions developed based on market data obtained from sources independent of UGA (observable inputs) and (2) UGA’s own assumptions about market participant assumptions developed based on the best information available under the circumstances (unobservable inputs). The three levels defined by the ASC 820 hierarchy are as follows:

Level I – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.

Level II – Inputs other than quoted prices included within Level I that are observable for the asset or liability, either directly or indirectly. Level II assets include the following: quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market-corroborated inputs).

Level III – Unobservable pricing input at the measurement date for the asset or liability. Unobservable inputs shall be used to measure fair value to the extent that observable inputs are not available.

In some instances, the inputs used to measure fair value might fall within different levels of the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement in its entirety falls shall be determined based on the lowest input level that is significant to the fair value measurement in its entirety.

The following table summarizes the valuation of UGA’s securities at December 31, 2014 using the fair value hierarchy:

At December 31, 2014

Total

Level I

Level II

Level III

Short-Term Investments

34,023,594

–

Exchange-Traded Futures Contracts

United States Contracts

-2,835,302

–

During the year ended December 31, 2014, there were no transfers between Level I and Level II.

The following table summarizes the valuation of UGA’s securities at December 31, 2013 using the fair value hierarchy:

At December 31, 2013

Total

Level I

Level II

Level III

Short-Term Investments

48,493,330

–

Exchange-Traded Futures Contracts

United States Contracts

2,598,553

–

During the year ended December 31, 2013, there were no transfers between Level I and Level II.

Effective January 1, 2009, UGA adopted the provisions of Accounting Standards Codification 815 – Derivatives and Hedging, which require presentation of qualitative disclosures about objectives and strategies for using derivatives, quantitative disclosures about fair value amounts and gains and losses on derivatives.

Fair Value of Derivative Instruments

Derivatives not

Accounted for as

Statements of Financial

Fair Value at

Hedging Instruments

Condition Location

December 31, 2014

December 31, 2013

Futures - Commodity Contracts

Assets

-2,835,302

2,598,553

The Effect of Derivative Instruments on the Statements of Operations

For the year ended

December 31, 2014

December 31, 2013

December 31, 2012

Change in

Location of

Realized

Unrealized

Realized

Unrealized

Realized

Unrealized

Derivatives not

Gain (Loss)

Accounted for

on Derivatives

as Hedging

Recognized

Instruments

in Income

Realized

gain on

closed

Futures - Commodity Contracts

positions

-21,284,156

3,496,995

17,063,315

Change in

unrealized

gain (loss)

on positions

-5,433,855

-9,790

-2,121,382

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	12 Months Ended
Recent Accounting Pronouncements	Dec. 31, 2014
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	NOTE 9 – RECENT ACCOUNTING PRONOUNCEMENTS

	In December 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-11, “Balance Sheet (Topic 210): Disclosures about Offsetting Assets and Liabilities.” The amendments in ASU No. 2011-11 require an entity to disclose information about offsetting and related arrangements to enable users of its financial statements to understand the effect of those arrangements on its financial position. ASU No. 2011-11 is effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods.

Subsequent_Events

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	NOTE 10 – SUBSEQUENT EVENTS

	UGA has performed an evaluation of subsequent events through the date the financial statements were issued. This evaluation did not result in any subsequent events that necessitated disclosures and/or adjustments, other than noted below:

	On January 14, 2015, Mr. Howard Mah, Management Director, Chief Financial Officer (Principal Accounting Officer), Secretary and Treasurer of USCF, general partner of United States Gasoline Fund, LP, tendered his resignation effective as soon as the Board of Directors of USCF accepts and appoints a suitable replacement, but no later than the close of business July 15, 2015. In order to ensure an orderly transition, Mr. Mah will remain as the Management Director and Chief Financial Officer (Principal Accounting Officer) of USCF until such time.

	On January 26, 2015, Mr. Nicholas D. Gerber was appointed Chief Executive Officer, President and Secretary of Concierge Technologies, Inc. (“Concierge”), a supplier of mobile video recording devices through its wholly owned subsidiary Janus Cam. Concierge is not affiliated with USCF and the Related Public Funds, other than through ownership by common control. Concierge is a publicly traded company under the ticker symbol “CNCG.”

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2014
Accounting Policies [Abstract]
Revenue Recognition	Revenue Recognition

	Commodity futures contracts, forward contracts, physical commodities, and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the statements of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the financial statements. Changes in the unrealized gains or losses between periods are reflected in the statements of operations. UGA earns interest on its assets denominated in U.S. dollars on deposit with the FCM at the 90-day Treasury bill rate. In addition, UGA earns income on funds held at the custodian or FCM at prevailing market rates earned on such investments.

Brokerage Commissions	Brokerage Commissions

	Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis.

Income Taxes	Income Taxes

	UGA is not subject to federal income taxes; each partner reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return.

	In accordance with accounting principles generally accepted in the United States of America (“GAAP”), UGA is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. UGA files an income tax return in the U.S. federal jurisdiction, and may file income tax returns in various U.S. states. UGA is not subject to income tax return examinations by major taxing authorities for years before 2011. The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in UGA recording a tax liability that reduces net assets. However, UGA’s conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analysis of and changes to tax laws, regulations and interpretations thereof. UGA recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the year ended December 31, 2014.

Creations and Redemptions	Creations and Redemptions

	Authorized Participants may purchase Creation Baskets or redeem Redemption Baskets only in blocks of 50,000 shares at a price equal to the NAV of the shares calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed.

	UGA receives or pays the proceeds from shares sold or redeemed within three business days after the trade date of the purchase or redemption. The amounts due from Authorized Participants are reflected in UGA’s statements of financial condition as receivable for shares sold, and amounts payable to Authorized Participants upon redemption are reflected as payable for shares redeemed.

Partnership Capital and Allocation of Partnership Income and Losses	Partnership Capital and Allocation of Partnership Income and Losses

	Profit or loss shall be allocated among the partners of UGA in proportion to the number of shares each partner holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the LP Agreement.

Calculation of Per Share Net Asset Value	Calculation of Per Share Net Asset Value (“NAV”)

	UGA’s per share NAV is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing that amount by the total number of shares outstanding. UGA uses the closing price for the contracts on the relevant exchange on that day to determine the value of contracts held on such exchange.

Net Income (Loss) Per Share	Net Income (Loss) Per Share

	Net income (loss) per share is the difference between the per share NAV at the beginning of each period and at the end of each period. The weighted average number of shares outstanding was computed for purposes of disclosing net income (loss) per weighted average share. The weighted average shares are equal to the number of shares outstanding at the end of the period, adjusted proportionately for shares added and redeemed based on the amount of time the shares were outstanding during such period. There were no shares held by USCF at December 31, 2014.

Offering Costs	Offering Costs

	Offering costs incurred in connection with the registration of additional shares after the initial registration of shares are borne by UGA. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. These costs are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted.

Cash Equivalents	Cash Equivalents

	Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of six months or less.

Reclassification	Reclassification

	Certain amounts in the accompanying financial statements were reclassified to conform to the current presentation.

Use of Estimates	Use of Estimates

	The preparation of financial statements in conformity with GAAP requires USCF to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

Contracts_and_Agreements_Table

Contracts and Agreements (Tables)	12 Months Ended
Contracts and Agreements (Tables)	Dec. 31, 2014
Contractors [Abstract]
Brokerage Commissions	UGA also incurs commissions to brokers for the purchase and sale of Futures Contracts, Other Gasoline-Related Investments or short-term obligations of the United States of two years or less (“Treasuries”).

		For the Year Ended			For the Year Ended			For the Year Ended
		December 31, 2014			December 31, 2013			December 31, 2012
	Total commissions accrued to brokers	$	38,600		$	39,110		$	63,245
	Annualized yield based on average daily total net assets		0.03	%		0.02	%		0.04	%
	Commissions accrued as a result of rebalancing	$	37,129		$	37,932		$	58,167
	Percentage of commissions accrued as a result of rebalancing		96.19	%		96.99	%		91.97	%
	Commissions accrued as a result of creation and redemption activity	$	1,471		$	1,178		$	5,078
	Percentage of commissions accrued as a result of creation and redemption activity		3.81	%		3.01	%		8.03	%

Financial_Highlights_Tables

Financial Highlights (Tables)	12 Months Ended
Financial Highlights (Tables)	Dec. 31, 2014
Supplemental Financial In Formation Disclosure [Abstract]
Per Unit Performance Data and Other Supplemental Financial Data	The following table presents per share performance data and other supplemental financial data for the years ended December 31, 2014, 2013 and 2012. This information has been derived from information presented in the financial statements.

		Year ended			Year ended			Year ended
		December 31, 2014			December 31, 2013			December 31, 2012
	Per Share Operating Performance:

	Net asset value, beginning of year	$	59.89		$	58.39		$	48.37
	Total income (loss)		-25.54			2.05			10.5
	Net expenses		-0.45			-0.55			-0.48
	Net increase (decrease) in net asset value		-25.99			1.5			10.02
	Net asset value, end of year	$	33.9		$	59.89		$	58.39

	Total Return		-43.4	%		2.57	%		20.72	%

	Ratios to Average Net Assets
	Total income (loss)		-54.43	%		5.99	%		16.34	%
	Management fees		0.6	%		0.6	%		0.6	%
	Total expenses excluding management fees		0.59	%		0.57	%		0.43	%
	Expenses waived		-0.37	%		-0.24	%		-0.15	%
	Net expenses excluding management fees		0.22	%		0.33	%		0.28	%
	Net income (loss)		-55.25	%		5.06	%		15.46	%

Quarterly_Financial_Data_Unaud1

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
Quarterly Financial Data (Unaudited) (Tables)	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	The following summarized (unaudited) quarterly financial information presents the results of operations and other data for three-month periods ended March 31, June 30, September 30 and December 31, 2014 and 2013.

		First Quarter		Second Quarter		Third Quarter		Fourth Quarter
		2014		2014		2014		2014
	Total income (loss)	$	-787,140	$	3,249,642	$	-6,561,635	$	-22,598,936
	Total expenses		141,716		129,964		154,487		158,731
	Expense waivers		-16,274		-21,363		-78,559		-66,030
	Net expenses		125,442		108,601		75,928		92,701
	Net income (loss)	$	-912,582	$	3,141,041	$	-6,637,563	$	-22,691,637
	Net income (loss) per share	$	-0.89	$	4.02	$	-8.61	$	-20.51

		First Quarter		Second Quarter		Third Quarter		Fourth Quarter
		2013		2013		2013		2013
	Total income (loss)	$	3,872,304	$	-6,924,190	$	2,797,327	$	3,761,843
	Total expenses		188,826		183,346		165,565		146,576
	Expense waivers		-44,756		-46,652		-30,338		-16,030
	Net expenses		144,070		136,694		135,227		130,546
	Net income (loss)	$	3,728,234	$	-7,060,884	$	2,662,100	$	3,631,297
	Net income (loss) per share	$	3.18	$	-7.25	$	1.87	$	3.7

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Valuation of Securities Using Fair Value Hierarchy

The following table summarizes the valuation of UGA’s securities at December 31, 2014 using the fair value hierarchy:

At December 31, 2014

Total

Level I

Level II

Level III

Short-Term Investments

34,023,594

–

Exchange-Traded Futures Contracts

United States Contracts

-2,835,302

–

During the year ended December 31, 2014, there were no transfers between Level I and Level II.

The following table summarizes the valuation of UGA’s securities at December 31, 2013 using the fair value hierarchy:

At December 31, 2013

Total

Level I

Level II

Level III

Short-Term Investments

48,493,330

–

Exchange-Traded Futures Contracts

United States Contracts

2,598,553

–

Fair Value of Derivative Instruments

Derivatives not

Accounted for as

Statements of Financial

Fair Value at

Hedging Instruments

Condition Location

December 31, 2014

December 31, 2013

Futures - Commodity Contracts

Assets

-2,835,302

2,598,553

Effect of Derivative Instruments on Condensed Statements of Operations

The Effect of Derivative Instruments on the Statements of Operations

For the year ended

December 31, 2014

December 31, 2013

December 31, 2012

Change in

Location of

Realized

Unrealized

Realized

Unrealized

Realized

Unrealized

Derivatives not

Gain (Loss)

Accounted for

on Derivatives

as Hedging

Recognized

Instruments

in Income

Realized

gain on

closed

Futures - Commodity Contracts

positions

-21,284,156

3,496,995

17,063,315

Change in

unrealized

gain (loss)

on positions

-5,433,855

-9,790

-2,121,382

Organization_and_Business_Addi

Organization and Business - Additional Information (Detail) (USD $)	0 Months Ended			12 Months Ended
	Jul. 01, 2011	Feb. 26, 2008	Nov. 30, 2007	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Jul. 01, 2011	Feb. 26, 2008	Contracts	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets	$1,000			$350
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission			30,000,000
Net asset value per unit		$50		$33.90		$59.89	$58.39	$48.37
Number of units issued		300,000
Value of units issued		$15,000,000
Number of registered units				80,000,000
Creation Baskets
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of units per basket				50,000
Open Cleared Swap and Futures Contracts \| Open Futures Contracts, Long \| United States \| NYMEX RBOB Gasoline Futures RB November 2014 contracts, expiring October 2014
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of contracts				658	[1]

[1]	Collateral amounted to $6,161,581 on open futures contracts.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
Creation Baskets
Significant Accounting Policies [Line Items]
Number of units per basket	50,000
Redemption Baskets
Significant Accounting Policies [Line Items]
Number of units per basket	50,000

Fees_Paid_By_The_Fund_And_Rela1

Fees Paid By The Fund And Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fees Paid and Related Party Transactions [Line Items]
USCF Management Fee									UGA is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.60% per annum of average daily total net assets.
Ongoing registration fees and other offering expenses									$46,454	$46,453	$20,911
Estimated directors' fees and expenses									12,396	13,365	18,888
Licensing fee incurred									7,357	8,779	13,751
Estimated investor tax reporting cost									164,000	225,000	225,000
Expense waivers	-66,030	-78,559	-21,363	-16,274	-16,030	-30,338	-46,652	-44,756	-182,226	-137,776	-139,446
Maximum
Fees Paid and Related Party Transactions [Line Items]
Costs and expenses annual limit for reimbursement									0.15%
UGA and the Related Public Funds
Fees Paid and Related Party Transactions [Line Items]
Estimated directors' fees and expenses									567,863	555,465	540,586
United States Gas Fund Lp
Fees Paid and Related Party Transactions [Line Items]
Estimated directors' fees and expenses									$12,396	$13,365	$18,888
Licensing Agreements [Member] \| On and after October 20, 2011
Fees Paid and Related Party Transactions [Line Items]
Assets basis for determining fee percentage									on all net assets
Costs and expenses annual limit for reimbursement									0.02%

Contracts_and_Agreements_Broke

Contracts and Agreements (Brokerage Commissions) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions	$38,600	$39,110	$63,245
Brokerage commissions as a percentage of average daily net assets	0.03%	0.02%	0.04%
Rebalancing Investments Transaction [Member]
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions	37,129	37,932	58,167
Brokerage commissions as a percentage of average daily net assets	96.19%	96.99%	91.97%
Creation And Redemption Activity [Member]
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions	$1,471	$1,178	$5,078
Brokerage commissions as a percentage of average daily net assets	3.81%	3.01%	8.03%

Contracts_and_Agreements_Addit

Contracts and Agreements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Annual transfer agency services fee	$20,000
Maximum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Transaction fees per transaction	15
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts	15
Minimum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Annual Fee for custody, fund accounting and fund administration services	75,000
Transaction fees per transaction	7
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts	7
First $500 million of the Related Public Funds' combined net assets
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.06%
First $500 million of the Related Public Funds' combined net assets \| Maximum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	500,000,000
Related Public Funds' combined net assets greater than $500 million but less than $1 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.05%
Related Public Funds' combined net assets greater than $500 million but less than $1 billion \| Maximum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	1,000,000,000
Related Public Funds' combined net assets greater than $500 million but less than $1 billion \| Minimum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	500,000,000
Related Public Funds' combined net assets exceed $1 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.04%
Related Public Funds' combined net assets exceed $1 billion \| Minimum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	1,000,000,000
Marketing Agreement [Member] \| Assets up to $3 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.06%
Marketing Agreement [Member] \| Assets up to $3 billion \| Maximum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	3,000,000,000
Marketing Agreement [Member] \| Assets in excess of $3 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.04%
Marketing Agreement [Member] \| Assets in excess of $3 billion \| Minimum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$3,000,000,000

Financial_Instruments_OffBalan1

Financial Instruments, Off-Balance Sheet Risks and Contingencies - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Cash investments in money market funds	$28,024,349	$38,494,983
Deposits in domestic and foreign financial institutions	$13,694,522	$15,751,658

Financial_Highlights_Per_Share

Financial Highlights (Per Share Performance Data and Other Supplemental Financial Data) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 26, 2008
Per Share Operating Performance:
Net asset value, beginning of year	$59.89	$58.39	$48.37	$50
Total income (loss)	($25.54)	$2.05	$10.50
Net expenses	($0.45)	($0.55)	($0.48)
Net increase (decrease) in net asset value	($25.99)	$1.50	$10.02
Net asset value, end of year	$33.90	$59.89	$58.39	$50
Total Return	-43.40%	2.57%	20.72%
Ratios to Average Net Assets
Total income (loss)	-54.43%	5.99%	16.34%
Management fees	0.60%	0.60%	0.60%
Total expenses excluding management fees	0.59%	0.57%	0.43%
Expenses waived	-0.37%	-0.24%	-0.15%
Net expenses excluding management fees	0.22%	0.33%	0.28%
Net income (loss)	-55.25%	5.06%	15.46%

Quarterly_Financial_Data_Summa

Quarterly Financial Data (Summarized (Unaudited) Quarterly Financial Information) (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Total income (loss)	($22,598,936)	($6,561,635)	$3,249,642	($787,140)	$3,761,843	$2,797,327	($6,924,190)	$3,872,304	($26,698,069)	$3,507,284	$14,980,190
Total expenses	158,731	154,487	129,964	141,716	146,576	165,565	183,346	188,826	584,898	684,313	942,484
Expense waivers	-66,030	-78,559	-21,363	-16,274	-16,030	-30,338	-46,652	-44,756	-182,226	-137,776	-139,446
Net expenses	92,701	75,928	108,601	125,442	130,546	135,227	136,694	144,070	402,672	546,537	803,038
Net income (loss)	($22,691,637)	($6,637,563)	$3,141,041	($912,582)	$3,631,297	$2,662,100	($7,060,884)	$3,728,234	($27,100,741)	$2,960,747	$14,177,152
Net income (loss) per share	($20.51)	($8.61)	$4.02	($0.89)	$3.70	$1.87	($7.25)	$3.18	($25.99)	$1.50	$10.02

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Valuation of Securities Using Fair Value Hierarchy) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Short-Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$34,023,594	$48,493,330
Exchange-Traded Futures Contracts \| United States
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	-2,835,302	2,598,553
Fair Value, Inputs, Level 1 \| Short-Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	34,023,594	48,493,330
Fair Value, Inputs, Level 1 \| Exchange-Traded Futures Contracts \| United States
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	-2,835,302	2,598,553
Fair Value, Inputs, Level 2 \| Short-Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
Fair Value, Inputs, Level 2 \| Exchange-Traded Futures Contracts \| United States
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
Fair Value, Inputs, Level 3 \| Short-Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
Fair Value, Inputs, Level 3 \| Exchange-Traded Futures Contracts \| United States
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$0	$0

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments (Fair Value of Derivative Instruments) (Detail) (Commodity Contracts, Futures, Assets, USD $)	Dec. 31, 2014	Dec. 31, 2013
Commodity Contracts \| Futures \| Assets
Derivatives, Fair Value [Line Items]
Derivatives not Accounted for as Hedging Instruments	($2,835,302)	$2,598,553

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments (Effect of Derivative Instruments on Condensed Statements of Operations) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	($21,284,156)	$3,496,995	$17,063,315
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	-5,433,855	-9,790	-2,121,382
Commodity Contracts \| Futures \| Realized gain (loss) on closed positions
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	-21,284,156	3,496,995	17,063,315
Commodity Contracts \| Futures \| Change in unrealized gain (loss) on open positions
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	($5,433,855)	($9,790)	($2,121,382)