Exhibit 99.1

           Tesoro Reports Second Quarter Earnings, Declares
                       Quarterly Cash Dividend


    SAN ANTONIO--(BUSINESS WIRE)--Aug. 4, 2005--Tesoro Corporation
(NYSE:TSO) today reported net earnings of $183.9 million, or $2.62 per
share, for the second quarter of 2005 compared to net earnings of
$213.1 million, or $3.11 per share, for the second quarter of 2004.
    As previously disclosed, results for the second quarter of 2005
include an after-tax charge of $1.8 million, or $0.03 per share to
write-off unamortized debt issuance costs and the prepayment premium
associated with the retirement of the company's $96.0 million Senior
Secured Term Loans. Excluding this special item, net earnings were
$185.7 million, or $2.65 per share.
    For the first half of 2005, the company reported net earnings of
$211.6 million, or $3.02 per share, compared to net earnings of $263.5
million, or $3.88 per share, for the first six months of 2004.
    Results for the first half of 2005 include after-tax charges of
$8.1 million, or $0.12 per share, for the charges associated with
prepayment of debt as well as expenses related to the termination and
retirement of certain executive officers. This compares to after-tax
charges of $1.2 million, or $0.02 per share, for debt financing costs
incurred in the first half of 2004. Excluding special items, net
earnings for the first half of 2005 were $219.7 million, or $3.14 per
share compared with $264.7 million, or $3.90 per share for the first
six months of 2004.
    "Our refining system achieved record throughput rates during the
quarter, even with the Hawaii turnaround," said Bruce A. Smith,
Chairman, President and CEO of Tesoro. "Increased utilization rates,
continued margin strength, and progress in achieving our stated
objectives around earnings initiatives contributed to our solid
results for the quarter. Increases in operating and administrative
expenses, however, reduced operating income year-over-year."
    Overall refinery operating expenses were higher year-over-year
mainly due to increased utility rates and throughput volumes, higher
maintenance expenses and employee costs, and allocation of information
technology expenses.
    "Over the last twelve months, we have completed major turnaround
work at our Golden Eagle, Anacortes, and Hawaii refineries allowing us
to achieve new milestones in production. Not only did we run at a
record 541,000 barrels per day during the quarter but we set a monthly
throughput record of 564,000 barrels per day in June. We were well
positioned in the second quarter to capture historically strong
margins and we continue to run well and capture today's strong
margins. That's allowing us to generate significant free cash flow,
which should make 2005 another banner year for Tesoro," Smith added.

    Quarterly Common Stock Dividend Declared

    Tesoro also announced today that its Board of Directors has
declared a cash dividend of $0.05 per share payable on September 15,
2005 to shareholders of record on September 1, 2005.

    Public Invited to Listen to Analyst Conference Call via Internet

    At 2:00 p.m., CDT, Thursday, August 4, 2005 Tesoro will broadcast,
live, its conference call with analysts regarding second quarter 2005
results. Interested parties may listen to the live conference call
over the Internet by logging on to Tesoro's Internet site at
http://www.tsocorp.com.
    Tesoro Corporation, a Fortune 500 Company, is an independent
refiner and marketer of petroleum products. Tesoro operates six
refineries in the western United States with a combined capacity of
nearly 560,000 barrels per day. Tesoro's retail-marketing system
includes approximately 500 branded retail stations, of which over 200
are company operated under the Tesoro(R) and Mirastar(R) brands.

    This news release contains certain statements that are
"forward-looking" statements within the meaning of Section 27A of the
Securities Act of 1933 and Section 21E of the Securities Exchange Act
of 1934. These forward-looking statements concern anticipated strong
industry refining margins in 2005 and our expectations to generate
free cash flow. Factors which can cause actual results to differ from
these forward-looking statements include: changes in general economic
conditions, the timing and extent of changes in demand for refined
products, availability and cost of crude oil, other feedstocks or
refined products, throughput and yield levels, disruptions due to
equipment interruptions or failure at our or third-party facilities,
and other factors beyond our control. For more information concerning
these factors and other factors that could cause such a difference,
see our annual report on Form 10-K and quarterly reports on Form 10-Q,
filed with the Securities and Exchange Commission. We undertake no
obligation to publicly release the result of any revisions to any such
forward-looking statements that may be made to reflect events or
circumstances that occur, or which we become aware of, after the date
hereof.

                          TESORO CORPORATION
                STATEMENTS OF CONSOLIDATED OPERATIONS
                             (Unaudited)
                (In millions except per share amounts)


                           Three Months Ended       Six Months Ended
                                June 30,                June 30,
                          ---------------------   --------------------
                            2005        2004        2005       2004
                          ----------  ---------   ---------  ---------
Revenues                 $  4,033.2  $ 3,155.0   $ 7,204.4  $ 5,584.9
Costs and Expenses:
 Costs of sales and
  operating expenses (a)    3,601.5    2,679.3     6,598.8    4,914.0
 Selling, general and
  administrative
  expenses (a) (b)             48.2       38.7       101.9       69.7
 Depreciation and
  amortization                 42.9       37.8        84.4       74.8
 Loss on asset disposals
  and impairments               3.9        3.5         5.1        4.1
                          ----------  ---------   ---------  ---------
Operating Income              336.7      395.7       414.2      522.3
 Interest and Financing
  Costs, Net (c)              (31.7)     (40.2)      (63.0)     (83.1)
                          ----------  ---------   ---------  ---------
   Earnings Before
    Income Taxes              305.0      355.5       351.2      439.2
Income Tax Provision          121.1      142.4       139.6      175.7
                          ----------  ---------   ---------  ---------
Net Earnings             $    183.9  $   213.1   $   211.6  $   263.5
                          ==========  =========   =========  =========
Net Earnings Per Share:
 Basic                   $     2.69  $    3.26   $    3.13  $    4.04
 Diluted                 $     2.62  $    3.11   $    3.02  $    3.88
Weighted Average
 Common Shares:
 Basic                         68.3       65.3        67.5       65.2
 Diluted                       70.1       68.6        70.1       68.0

- -------------------
(a) For the three and six months ended June 30, 2005, the Company
    allocated certain information technology costs totaling $7.4
    million and $13.9 million, respectively, previously reported as
    selling, general and administrative expenses, to costs of sales
    and operating expenses in order to better reflect costs directly
    attributable to our segment operations.

(b) During the six months ended June 30, 2005, the Company recorded
    stock-based and other compensation charges totaling $10.5 million
    related to the termination and retirement of certain executive
    officers.

(c) In April 2005, the Company voluntarily prepaid the remaining $96
    million outstanding principal balance of our senior secured term
    loans at a prepayment premium of 1%, which resulted in a pretax
    charge of $2.9 million consisting of the write-off of unamortized
    debt issuance costs and the 1% prepayment premium. During the six
    months ended June 30, 2004, the Company recorded pretax financing
    expenses of $2.0 million related to amending both the 8% senior
    secured notes and the senior secured term loans.


               NET EARNINGS ADJUSTED FOR SPECIAL ITEMS
                             (Unaudited)
                (In millions except per share amounts)


                                 Three Months Ended   Six Months Ended
                                      June 30,            June 30,
                                 ------------------   ----------------
                                   2005      2004      2005     2004
                                 ---------  -------   -------  -------
Net Earnings - U.S. GAAP        $   183.9  $ 213.1   $ 211.6  $ 263.5
Special Items, After-tax:
  Termination and retirement
   costs (b)                            -        -       6.3        -
  Debt prepayment and financing
   costs (c)                          1.8        -       1.8      1.2
                                 ---------  -------   -------  -------
Net Earnings Adjusted for
 Special Items                  $   185.7  $ 213.1   $ 219.7  $ 264.7
                                 =========  =======   =======  =======

Net Earnings Per Share - U.S.
 GAAP                           $    2.62  $  3.11   $  3.02  $  3.88
Special Items Per Share,
 After-tax:
  Termination and retirement
   costs (b)                            -        -      0.09        -
  Debt prepayment and financing
   costs (c)                         0.03        -      0.03     0.02
                                 ---------  -------   -------  -------
Net Earnings Per Share
 Adjusted for Special Items     $    2.65  $  3.11   $  3.14  $  3.90
                                 =========  =======   =======  =======

- -------------------
Note: The special items present information that the Company
      believes is useful to investors. The Company believes that the
      special items described above are not indicative of its core
      operations.


                          TESORO CORPORATION
                   SELECTED OPERATING SEGMENT DATA
                             (Unaudited)
                            (In millions)


                                  Three Months Ended  Six Months Ended
                                       June 30,           June 30,
                                  ------------------  ----------------
                                   2005      2004      2005     2004
                                  --------  --------  -------  -------
Operating Income (Loss)
  Refining (d)                   $  383.0  $  427.5  $ 515.7  $ 579.1
  Retail (d)                         (6.9)     (1.5)   (18.2)    (5.7)
                                  --------  --------  -------  -------
   Total Segment Operating
    Income                          376.1     426.0    497.5    573.4
  Corporate and Unallocated
   Costs (b) (d)                    (35.5)    (26.8)   (78.2)   (47.0)
  Loss on Asset Disposals and
   Impairments                       (3.9)     (3.5)    (5.1)    (4.1)
                                  --------  --------  -------  -------
   Operating Income                 336.7     395.7    414.2    522.3
  Interest and Financing Costs,
   Net (c)                          (31.7)    (40.2)   (63.0)   (83.1)
                                  --------  --------  -------  -------
   Earnings Before Income Taxes  $  305.0  $  355.5  $ 351.2  $ 439.2
                                  ========  ========  =======  =======

Depreciation and Amortization
  Refining                       $   36.6  $   31.8  $  71.8  $  62.8
  Retail                              4.2       4.4      8.5      8.8
  Corporate                           2.1       1.6      4.1      3.2
                                  --------  --------  -------  -------
   Depreciation and Amortization $   42.9  $   37.8  $  84.4  $  74.8
                                  ========  ========  =======  =======

Capital Expenditures
  Refining                       $   48.2  $   28.8  $  85.2  $  43.3
  Retail                              1.3       0.9      1.5      1.0
  Corporate                           2.7       1.7     29.4      2.0
                                  --------  --------  -------  -------
   Capital Expenditures          $   52.2  $   31.4  $ 116.1  $  46.3
                                  ========  ========  =======  =======

- -------------------
(d) For the three and six months ended June 30, 2005, the Company
    allocated certain information technology costs totaling $7.4
    million and $13.9 million, respectively, from corporate and
    unallocated costs to segment operating income. The $7.4 million
    for the three months ended June 30, 2005 included $5.9 million in
    refining and $1.5 million in retail. The $13.9 million for the six
    months ended June 30, 2005 included $10.8 million in refining and
    $3.1 million in retail.


                          BALANCE SHEET DATA
                             (Unaudited)
                        (Dollars in millions)


                                    June 30,   March 31,  December 31,
                                      2005       2005        2004
                                    ---------  ---------  ------------
Cash and Cash Equivalents          $    96.2  $    89.1  $      184.8
Total Assets                       $ 4,487.0  $ 4,391.7  $    4,075.1
Total Debt                         $ 1,132.8  $ 1,227.4  $    1,218.3
Total Stockholders' Equity         $ 1,595.8  $ 1,389.4  $    1,327.1
Total Debt to Capitalization Ratio        42%        47%           48%

Total Debt                         $ 1,132.8  $ 1,227.4  $    1,218.3
Less:  Cash and Cash Equivalents   $    96.2  $    89.1  $      184.8
                                    ---------  ---------  ------------
  Net Debt (e)                     $ 1,036.6  $ 1,138.3  $    1,033.5
Total Stockholders' Equity         $ 1,595.8  $ 1,389.4  $    1,327.1
                                    ---------  ---------  ------------
  Net Capitalization (e)           $ 2,632.4  $ 2,527.7  $    2,360.6
Net Debt to Net Capitalization
 Ratio (e)                                39%        45%           44%

- -------------------
(e) Net debt represents total debt less cash and cash equivalents. Net
    capitalization represents the total of net debt and total
    stockholders' equity. The Company believes net debt to net
    capitalization is useful in measuring our financial leverage. Net
    debt to net capitalization should not be considered as an
    alternative to debt to capitalization or any measure of financial
    leverage presented in accordance with accounting principles
    generally accepted in the United States of America. Net debt to
    net capitalization may not be comparable to similarly titled
    measures used by other companies.


                          TESORO CORPORATION
                            OPERATING DATA
                             (Unaudited)


                                Three Months Ended   Six Months Ended
                                     June 30,            June 30,
                                ------------------  ------------------
                                  2005      2004      2005      2004
                                ---------  -------  ---------  -------
REFINING SEGMENT
 Total Refining Segment
  Throughput (thousand
   barrels per day)
   Heavy crude                     271.2    290.5      267.0    281.2
   Light crude                     250.6    225.6      219.6    218.6
   Other feedstocks                 19.0     21.7       22.5     17.9
                                ---------  -------  ---------  -------
          Total Throughput         540.8    537.8      509.1    517.7
                                =========  =======  =========  =======

  Yield (thousand barrels per
   day)
   Gasoline and gasoline
    blendstocks                    257.6    261.8      240.5    253.8
   Jet fuel                         66.4     64.0       65.6     64.1
   Diesel fuel                     125.8    115.8      108.5    109.6
   Heavy oils, residual
    products, internally
    produced fuel and other        111.2    115.1      113.5    109.7
                                ---------  -------  ---------  -------
          Total Yield              561.0    556.7      528.1    537.2
                                =========  =======  =========  =======

  Refining Margin
   ($/throughput bbl) (f)
   Gross                       $   13.28  $ 13.20  $   11.00  $ 10.50
   Manufacturing cost before
    depreciation and
    amortization (f)           $    3.36  $  2.83  $    3.45  $  2.85

  Segment Operating Income
   ($ millions)
   Gross refining margin
    (after inventory
    changes) (g)               $   640.2  $ 639.0  $ 1,007.1  $ 987.0
   Expenses
    Manufacturing costs            165.2    138.3      317.7    268.8
    Other operating expenses        48.4     35.0       87.5     64.5
    Selling, general and
     administrative                  7.0      6.4       14.4     11.8
    Depreciation and
     amortization (h)               36.6     31.8       71.8     62.8
                                ---------  -------  ---------  -------
           Segment Operating
            Income             $   383.0  $ 427.5  $   515.7  $ 579.1
                                =========  =======  =========  =======

  Product Sales (thousand
   barrels per day) (i)
   Gasoline and gasoline
    blendstocks                    306.7    307.7      287.3    298.5
   Jet fuel                        102.2     86.3       99.0     82.9
   Diesel fuel                     142.4    139.4      132.7    129.6
   Heavy oils, residual
    products and other              75.6     76.2       72.3     76.1
                                ---------  -------  ---------  -------
          Total Product Sales      626.9    609.6      591.3    587.1
                                =========  =======  =========  =======

  Product Sales Margin
   ($/barrel) (i)
   Average sales price         $   67.06  $ 54.38  $   63.34  $ 49.86
   Average costs of sales          56.14    42.79      53.91    40.44
                                ---------  -------  ---------  -------
          Product Sales Margin $   10.92  $ 11.59  $    9.43  $  9.42
                                =========  =======  =========  =======

- -------------------
(f) Management uses gross refining margin per barrel to evaluate
    performance, allocate resources and compare profitability to other
    companies in the industry. Gross refining margin per barrel is
    calculated by dividing gross refining margin before inventory
    changes by total refining throughput and may not be calculated
    similarly by other companies. Management uses manufacturing costs
    per barrel to evaluate the efficiency of refinery operations and
    allocate resources. Manufacturing costs per barrel may not be
    comparable to similarly titled measures used by other companies.
    Investors and analysts use these financial measures to help
    analyze and compare companies in the industry on the basis of
    operating performance. These financial measures should not be
    considered as alternatives to segment operating income, revenues,
    costs of sales and operating expenses or any other measure of
    financial performance presented in accordance with accounting
    principles generally accepted in the United States of America.

(g) Gross refining margin is revenues less costs of refining
    feedstocks, purchased products, transportation and distribution.
    Gross refining margin approximates total refining segment
    throughput times gross refining margin per barrel, adjusted for
    changes in refined product inventory due to selling a volume and
    mix of product that is different than actual volumes manufactured.
    Also includes the effect of intersegment sales to the retail
    segment at prices which approximate market.

(h) Includes manufacturing depreciation and amortization per
    throughput barrel of approximately $0.66 and $0.57 for the three
    months ended June 30, 2005 and 2004, respectively, and $0.70 and
    $0.59 for the six months ended June 30, 2005 and 2004,
    respectively.

(i) Sources of total product sales include products manufactured at
    the refineries, products drawn from inventory balances and
    products purchased from third parties. Total product sales margin
    includes margins on sales of manufactured and purchased products
    and the effects of inventory changes.


                          TESORO CORPORATION
                            OPERATING DATA
                             (Unaudited)


                                   Three Months Ended Six Months Ended
                                        June 30,          June 30,
                                   ------------------ ----------------
                                     2005      2004    2005     2004
                                   ---------  ------- -------  -------
Refining By Region
 California (j)
  Throughput (thousand barrels
   per day)
   Heavy crude                        156.2    146.8   150.1    145.5
   Light crude                          6.1      1.0     3.1      2.5
   Other feedstocks                     8.2     14.1     6.7      9.5
                                   ---------  ------- -------  -------
          Total Throughput            170.5    161.9   159.9    157.5
                                   =========  ======= =======  =======

  Yield (thousand barrels per
   day)
   Gasoline and gasoline
    blendstocks                       100.0    102.6    91.0    100.2
   Diesel fuel                         51.1     41.4    45.9     39.1
   Heavy oils, residual products,
    internally produced fuel
    and other                          28.7     27.1    31.4     27.6
                                   ---------  ------- -------  -------
          Total Yield                 179.8    171.1   168.3    166.9
                                   =========  ======= =======  =======

  Refining Margin ($/throughput
   bbl)
   Gross                          $   19.23  $ 19.51 $ 18.00  $ 15.42
   Manufacturing cost before
    depreciation and amortization $    5.31  $  4.63 $  5.42  $  4.62

 Pacific Northwest (Alaska &
  Washington) (j)
  Throughput (thousand barrels
   per day)
   Heavy crude                         96.4     92.5    88.8     88.5
   Light crude                         80.3     80.4    61.4     76.6
   Other feedstocks                     5.6      2.6    11.3      3.9
                                   ---------  ------- -------  -------
          Total Throughput            182.3    175.5   161.5    169.0
                                   =========  ======= =======  =======

  Yield (thousand barrels per
   day)
   Gasoline and gasoline
    blendstocks                        77.9     74.3    70.3     71.8
   Jet fuel                            34.3     30.0    31.2     29.3
   Diesel fuel                         29.5     28.2    20.6     27.5
   Heavy oils, residual products,
    internally produced fuel
    and other                          46.1     47.5    44.8     45.0
                                   ---------  ------- -------  -------
          Total Yield                 187.8    180.0   166.9    173.6
                                   =========  ======= =======  =======

  Refining Margin ($/throughput
   bbl)
   Gross                          $   12.08  $ 11.98 $  8.83  $  9.32
   Manufacturing cost before
    depreciation and amortization $    2.42  $  2.32 $  2.76  $  2.35

 Mid-Pacific (Hawaii) (j)
  Throughput (thousand barrels
   per day)
   Heavy crude                         18.6     51.2    28.1     47.2
   Light crude                         51.3     34.0    48.7     37.6
                                   ---------  ------- -------  -------
          Total Throughput             69.9     85.2    76.8     84.8
                                   =========  ======= =======  =======

  Yield (thousand barrels per
   day)
   Gasoline and gasoline
    blendstocks                        16.3     21.5    17.9     22.3
   Jet fuel                            20.5     24.0    23.4     24.4
   Diesel fuel                         10.8     13.3    11.4     14.2
   Heavy oils, residual products,
    internally produced fuel
    and other                          23.5     27.6    25.2     25.3
                                   ---------  ------- -------  -------
          Total Yield                  71.1     86.4    77.9     86.2
                                   =========  ======= =======  =======

  Refining Margin ($/throughput
   bbl)
   Gross                          $    6.71  $  7.63 $  5.26  $  6.09
   Manufacturing cost before
    depreciation and amortization $    2.52  $  1.44 $  2.06  $  1.38

- -------------------
(j) During the 2005 second quarter, throughput and yield levels were
    reduced at our Hawaii refinery as a result of a scheduled major
    maintenance turnaround. Throughput and yield levels were reduced
    during the 2005 first quarter at our California and Washington
    refineries due to scheduled major maintenance turnarounds and
    unscheduled downtime.


                          TESORO CORPORATION
                            OPERATING DATA
                             (Unaudited)


                                  Three Months Ended  Six Months Ended
                                       June 30,           June 30,
                                  ------------------  ----------------
                                    2005      2004     2005     2004
                                  ---------  -------  -------  -------
 Mid-Continent (North Dakota &
  Utah)
  Throughput (thousand barrels
   per day)
   Light crude                       112.9    110.2    106.4    101.9
   Other feedstocks                    5.2      5.0      4.5      4.5
                                  ---------  -------  -------  -------
          Total Throughput           118.1    115.2    110.9    106.4
                                  =========  =======  =======  =======

  Yield (thousand barrels per
   day)
   Gasoline and gasoline
    blendstocks                       63.4     63.4     61.3     59.5
   Jet fuel                           11.6     10.0     11.0     10.4
   Diesel fuel                        34.4     32.9     30.6     28.8
   Heavy oils, residual
    products, internally
    produced fuel and other           12.9     12.9     12.1     11.8
                                  ---------  -------  -------  -------
          Total Yield                122.3    119.2    115.0    110.5
                                  =========  =======  =======  =======

  Refining Margin ($/throughput
   bbl)
   Gross                         $   10.19  $ 10.28  $  7.82  $  8.57
   Manufacturing cost before
    depreciation and
    amortization                 $    2.48  $  2.09  $  2.58  $  2.21


                          TESORO CORPORATION
                            OPERATING DATA
                             (Unaudited)


                                  Three Months Ended  Six Months Ended
                                       June 30,           June 30,
                                  ------------------  ----------------
                                    2005      2004     2005     2004
                                  ----------  ------  -------  -------
RETAIL SEGMENT
 Number of Stations (end of
  period)
  Company-operated                      213     223      213      223
  Branded jobber/dealer                 283     317      283      317
                                  ----------  ------  -------  -------
   Total Stations                       496     540      496      540
                                  ==========  ======  =======  =======

 Average Stations (during
  period)
  Company-operated                      214     223      214      224
  Branded jobber/dealer                 286     320      289      323
                                  ----------  ------  -------  -------
   Total Average Retail Stations        500     543      503      547
                                  ==========  ======  =======  =======

 Fuel Sales (millions of
  gallons)
  Company-operated                     67.1    72.9    132.1    142.5
  Branded jobber/dealer                49.5    55.9     95.5    109.2
                                  ----------  ------  -------  -------
   Total Fuel Sales                   116.6   128.8    227.6    251.7
                                  ==========  ======  =======  =======

 Fuel Margin ($/gallon) (k)      $     0.15  $ 0.14  $  0.13  $  0.14
 Merchandise Sales ($ millions)  $     35.5  $ 32.5  $  65.4  $  60.7
 Merchandise Margin ($ millions) $      9.1  $  9.1  $  16.7  $  16.4
 Merchandise Margin %                    26%     28%      26%      27%

 Segment Operating Loss
  ($ millions)
  Gross Margins
   Fuel (l)                      $     16.9  $ 18.4  $  29.8  $  35.9
   Merchandise and other non-
    fuel margin                         9.9    10.0     18.3     18.2
                                  ----------  ------  -------  -------
   Total Gross Margins                 26.8    28.4     48.1     54.1
  Expenses
   Operating expenses                  21.7    18.3     44.4     36.8
   Selling, general and
    administrative                      7.8     7.2     13.4     14.2
   Depreciation and amortization        4.2     4.4      8.5      8.8
                                  ----------  ------  -------  -------
   Segment Operating Loss        $     (6.9) $ (1.5) $ (18.2) $  (5.7)
                                  ==========  ======  =======  =======

- -------------------
(k) Management uses fuel margin per gallon to compare profitability to
    other companies in the industry. Investors and analysts use fuel
    margin per gallon to help analyze and compare companies in the
    industry on the basis of operating performance. Fuel margin per
    gallon is calculated by dividing fuel gross margin by fuel sales
    volumes. Fuel margin per gallon may not be calculated similarly by
    other companies.

(l) Includes the effect of intersegment purchases from the refining
    segment at prices which approximate market.


    CONTACT: Tesoro Corporation, San Antonio
             Investors:
             A. Pierre Dubois, 210-283-2164
             or
             Media:
             Sarah Simpson, 210-283-2374