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                                                                    EXHIBIT 3.12

                          INDEPENDENT GASOLINE AND OIL
                           COMPANY OF ROCHESTER, INC.

                                    * * * * *

                                    BY - LAWS

                                    * * * * *

                                    ARTICLE I

                                     OFFICES

      Section 1. The office of the corporation shall be located in Rochester,
County of Monroe, State of New York.

      Section 2. The corporation may also have offices at such other places both
within and without the State of New York as the board of directors may from time
to time determine or the business of the corporation may require.

                                   ARTICLE II

                         ANNUAL MEETINGS OF SHAREHOLDERS

      Section 1. All meetings of shareholders for the election of directors
shall be held in Warren, State of Pennsylvania, at such place as may be fixed
from time to time by the board of directors.
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      Section 2. Annual meetings of shareholders, commencing with the year 1979,
shall be held on the second Wednesday of June if not a legal holiday, and if a
legal holiday, then on the next secular day following, at which they shall elect
by a plurality vote, a board of directors, and transact such other business as
may properly be brought before the meeting.

      Section 3. Written or printed notice of the annual meeting stating the
place, date and hour of the meeting shall be delivered not less than ten nor
more than fifty days before the date of the meeting, either personally or by
mail, by or at the direction of the president, the secretary, or the officer or
persons calling the meeting, to each shareholder of record entitled to vote at
such meeting.

                                   ARTICLE III

                        SPECIAL MEETINGS OF SHAREHOLDERS

      Section 1. Special meetings of shareholders may be held at such time and
place within or without the State of New York as shall be stated in the notice
of the meeting or in a duly executed waiver of notice thereof.

      Section 2. Special meetings of the shareholders, for any purpose or
purposes, unless otherwise prescribed by statute or by the certificate of
incorporation, may be called by the president, the board of directors, or the
holders of
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not less than a majority of all the shares entitled to vote at the meeting.

      Section 3. Written or printed notice of a special meeting stating the
place, date and hour of the meeting and the purpose or purposes for which the
meeting is called, shall be delivered not less than ten nor more than fifty days
before the date of the meeting, either personally or by mail, by, or at the
direction of, the president, the secretary, or the officer or persons calling
the meeting, to each shareholder of record entitled to vote at such meeting. The
notice should also indicate that it is being issued by, or at the direction of,
the person calling the meeting.

      Section 4. The business transacted at any special meeting of shareholders
shall be limited to the purposes stated in the notice.

                                   ARTICLE IV

                           QUORUM AND VOTING OF STOCK

      Section 1. The holders of a majority of the shares of stock issued and
outstanding and entitled to vote, represented in person or by proxy, shall
constitute a quorum at all meetings of the shareholders for the transaction of
business except as otherwise provided by statute or by the certificate of
incorporation. If, however, such quorum shall not be present or represented at
any meeting of the shareholders, the shareholders present in person or
represented by proxy
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shall have power to adjourn the meeting from time to time, without notice other
than announcement at the meeting, until a quorum shall be present or
represented. At such adjourned meeting at which a quorum shall be present or
represented any business may be transacted which might have been transacted at
the meeting as originally notified.

      Section 2. If a quorum is present, the affirmative vote of a majority of
the shares of stock represented at the meeting shall be the act of the
shareholders, unless the vote of a greater or lesser number of shares of stock
is required by law or the certificate of incorporation.

      Section 3. Each outstanding share of stock having voting power shall be
entitled to one vote on each matter submitted to a vote at a meeting of
shareholders. A shareholder may vote either in person or by proxy executed in
writing by the shareholder or by his duly authorized attorney-in-fact.

      Section 4. The board of directors in advance of any shareholders' meeting
may appoint one or more inspectors to act at the meeting or any adjournment
thereof. If inspectors are not so appointed, the person presiding at a
shareholders' meeting may, and, on the request of any shareholder entitled to
vote thereat, shall appoint one or more inspectors. In case any person appointed
as inspector fails to appear or act, the vacancy may be filled by the board in
advance of the meeting or at the meeting by the person presiding thereat. Each
inspector, before entering upon the discharge of
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his duties, shall take and sign an oath faithfully to execute the duties of
inspector at such meeting with strict impartiality and according to the best of
his ability.

      Section 5. Whenever shareholders are required or permitted to take any
action by vote, such action may be taken without a meeting on written consent,
setting forth the action so taken, signed by the holders of all outstanding
shares entitled to vote thereon.

                                    ARTICLE V

                                    DIRECTORS

      Section 1. The number of directors shall be not less than three nor more
than ten. The first board shall consist of six directors. Thereafter, within the
limits above specified, the number of directors shall be determined by
resolution of the board of directors or by the shareholders at the annual
meeting. Directors shall be at least eighteen years of age and need not be
residents of the State of New York nor shareholders of the corporation. The
directors, other than the first board of directors, shall be elected at the
annual meeting of the shareholders, except as hereinafter provided, and each
director elected shall serve until the next succeeding annual meeting and until
his successor shall have been elected and qualified. The first board of
directors shall hold office until the first annual meeting of shareholders.
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      Section 2. Any or all of the directors may be removed, with or without
cause, at any time by the vote of the shareholders at a special meeting called
for that purpose.

      Any director may be removed for cause by the action of the directors at a
special meeting called for that purpose.

      Section 3. Unless otherwise provided in the certificate of incorporation,
newly created directorships resulting from an increase in the board of directors
and all vacancies occurring in the board of directors, including vacancies
caused by removal without cause, may be filled by the affirmative vote of a
majority of the board of directors, however, if the number of directors then in
office is less than a quorum then such newly created directorships and vacancies
may be filled by a vote of a majority of the directors then in office. A
director elected to fill a vacancy shall hold office until the next meeting of
shareholders at which election of directors is the regular order of business,
and until his successor shall have been elected and qualified. A director
elected to fill a newly created directorship shall serve until the next
succeeding annual meeting of shareholders and until his successor shall have
been elected and qualified.
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      Section 4. The business affairs of the corporation shall be managed by its
board of directors which may exercise all such powers of the corporation and do
all such lawful acts and things as are not by statute or by the certificate of
incorporation or by these by-laws directed or required to be exercised or done
by the shareholders.

      Section 5. The directors may keep the books of the corporation, except
such as are required by law to be kept within the state, outside the State of
New York, at such place or places as they may from time to time determine.

      Section 6. The board of directors, by the affirmative vote of a majority
of the directors then in office, and irrespective of any personal interest of
any of its members, shall have authority to establish reasonable compensation of
all directors for services to the corporation as directors, officers or
otherwise.

                                   ARTICLE VI

                       MEETINGS OF THE BOARD OF DIRECTORS

      Section 1. Meetings of the board of directors, regular or special, may be
held either within or without the State of New York.

      Section 2. The first meeting of each newly elected board of directors
shall be held at such time and place as shall be fixed by the vote of the
shareholders at the annual meeting and no notice of such meeting shall be
necessary to
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the newly elected directors in order legally to constitute the meeting, provided
a quorum shall be present, or it may convene at such place and time as shall be
fixed by the consent in writing of all the directors.

      Section 3. Regular meetings of the board of directors may be held upon
such notice, or without notice, and at such time and at such place as shall from
time to time be determined by the board.

      Section 4. Special meetings of the board of directors may be called by the
president on three days' notice to each director, either personally or by mail
or by telegram; special meetings shall be called by the president or secretary
in like manner and on like notice on the written request of two directors.

      Section 5. Notice of a meeting need not be given to any director who
submits a signed waiver of notice whether before or after the meeting, or who
attends the meeting without protesting, prior thereto or at its commencement,
the lack of notice. Neither the business to be transacted at, nor the purpose
of, any regular or special meeting of the board of directors need be specified
in the notice or waiver of notice of such meeting.

      Section 6. A majority of the directors shall constitute a quorum for the
transaction of business unless a greater or lesser number is required by law or
by the
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certificate of incorporation. The vote of a majority of the directors present at
any meeting at which a quorum is present shall be the act of the board of
directors, unless the vote of a greater number is required by law or by the
certificate of incorporation. If a quorum shall not be present at any meeting of
directors, the directors present may adjourn the meeting from time to time,
without notice other than announcement at the meeting, until a quorum shall be
present.

      Section 7. Unless otherwise restricted by the certificate of incorporation
or these by-laws, members of the board of directors, or any committee designated
by the board of directors, may participate in a meeting of the board of
directors, or any committee, by means of conference telephone or similar
communications equipment by means of which all persons participating in the
meeting can hear each other, and such participation in a meeting shall
constitute presence in person at the meeting.

      Section 8. Unless the certificate of incorporation provides otherwise, any
action required or permitted to be taken at a meeting of the directors or a
committee thereof may be taken without a meeting if a consent in writing to the
adoption of a resolution authorizing the action so taken, shall be signed by all
of the directors entitled to vote with respect to the subject matter thereof.
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                                   ARTICLE VII

                               EXECUTIVE COMMITTEE

      Section 1. The board of directors, by resolution adopted by a majority of
the entire board, may designate, from among its members, an executive committee
and other committees, each consisting of three or more directors, and each of
which, to the extent provided in the resolution, shall have all the authority of
the board, except as otherwise required by law. Vacancies in the membership of
the committee shall be filled by the board of directors at a regular or special
meeting of the board of directors. The executive committee shall keep regular
minutes of its proceedings and report the same to the board when required.

                                  ARTICLE VIII

                                     NOTICES

      Section 1. Whenever, under the provisions of the statutes or of the
certificate of incorporation or of these by-laws, notice is required to be given
to any director or shareholder, it shall not be construed to mean personal
notice, but such notice may be given in writing, by mail, addressed to such
director or shareholder, at his address as it appears on the records of the
corporation, with postage thereon prepaid, and such notice shall be deemed to be
given at the time when the same shall be deposited in the United States mail.
Notice to directors may also be given by telegram.
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      Section 2. Whenever any notice of a meeting is required to be given under
the provisions of the statutes or under the provisions of the certificate of
incorporation or these by-laws, a waiver thereof in writing signed by the person
or persons entitled to such notice, whether before or after the time stated
therein, shall be deemed equivalent to the giving of such notice.

                                   ARTICLE IX

                                    OFFICERS

      Section 1. The officers of the corporation shall be chosen by the board of
directors and shall be a president, a vice-president, a secretary and a
treasurer. The board of directors may also choose additional vice-presidents,
and one or more assistant secretaries and assistant treasurers.

      Section 2. The board of directors at its first meeting after each annual
meeting of shareholders shall choose a president, one or more vice-presidents, a
secretary and a treasurer, none of whom need be a member of the board.

      Any two or more offices may be held by the same person, except the offices
of president and secretary. When all the issued and outstanding stock of the
corporation is owned by one person, such person may hold all or any combination
of offices.

      Section 3. The board of directors may appoint such other officers and
agents as it shall deem necessary who shall hold their offices for such terms
and shall exercise such powers and perform such duties as shall be determined
from time to time by the board of directors.
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      Section 4. The salaries of all officers and agents of the corporation
shall be fixed by the board of directors.

      Section 5. The officers of the corporation shall hold office until their
successors are chosen and qualify. Any officer elected or appointed by the board
of directors may be removed at any time by the affirmative vote of a majority of
the board of directors. Any vacancy occurring in any office of the corporation
shall be filled by the board of directors.

                                  THE PRESIDENT

      Section 6. The president shall be the chief executive officer of the
corporation, shall preside at all meetings of the shareholders and the board of
directors, shall have general and active management of the business of the
corporation and shall see that all orders and resolutions of the board of
directors are carried into effect.

      Section 7. He shall execute bonds, mortgages and other contracts requiring
a seal under the seal of the corporation, except where required or permitted by
law to be otherwise signed and executed and except where the signing and
execution thereof shall be expressly delegated by the board of directors to some
other officer or agent of the corporation.

                               THE VICE-PRESIDENTS

      Section 8. The vice-president or, if there shall be more than one, the
vice-presidents in the order determined by the board of directors, shall, in the
absence or disability of the president, perform the duties and exercise the
powers of the
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president and shall perform such other duties and have such other powers as the
board of directors may from time to time prescribe.

      THE SECRETARY AND ASSISTANT SECRETARIES

      Section 9. The secretary shall attend all meetings of the board of
directors and all meetings of the shareholders and record all the proceedings of
the meetings of the corporation and of the board of directors in a book to be
kept for that purpose and shall perform like duties for the standing committees
when required. He shall give, or cause to be given, notice of all meetings of
the shareholders and special meetings of the board of directors, and shall
perform such other duties as may be prescribed by the board of directors or
president, under whose supervision he shall be. He shall have custody of the
corporate seal of the corporation and he, or an assistant secretary, shall have
authority to affix the same to any instrument requiring it and, when so affixed,
it may be attested by his signature or by the signature of such assistant
secretary. The board of directors may give general authority to any other
officer to affix the seal of the corporation and to attest the affixing by his
signature.

      Section 10. The assistant secretary or, if there be more than one, the
assistant secretaries in the order determined by the board of directors, shall,
in the absence or disability of the secretary, perform the duties and exercise
the powers of the secretary and shall perform such other duties and have such
other powers as the board of directors may from time to time prescribe.
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      THE TREASURER AND ASSISTANT TREASURERS

      Section 11. The treasurer shall have the custody of the corporate funds
and securities and shall keep full and accurate accounts of receipts and
disbursements in books belonging to the corporation and shall deposit all moneys
and other valuable effects in the name and to the credit of the corporation in
such depositories as may be designated by the board of directors.

      Section 12. He shall disburse the funds of the corporation as may be
ordered by the board of directors, taking proper vouchers for such
disbursements, and shall render to the president and the board of directors at
its regular meetings, or when the board of directors so requires, an account of
all his transactions as treasurer and of the financial condition of the
corporation.

      Section 13. If required by the board of directors, he shall give the
corporation a bond in such sum and with such surety or sureties as shall be
satisfactory to the board of directors for the faithful performance of the
duties of his office and for the restoration to the corporation, in case of his
death, resignation, retirement or removal from office, of all books, papers,
vouchers, money and other property of whatever kind in his possession or under
his control belonging to the corporation.

      Section 14. The assistant treasurer, or, if there shall be more than one,
the assistant treasurers in the order determined by the board of directors,
shall, in the absence or disability of the treasurer, perform the duties and
exercise the powers of the treasurer and shall perform such other duties and
have such other
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powers as the board of directors may from time to time prescribe.

                                    ARTICLE X

                             CERTIFICATES FOR SHARES

      Section 1. The shares of the corporation shall be represented by
certificates signed by the chairman or vice-chairman of the board or the
president or a vice-president and the secretary or an assistant secretary or the
treasurer or an assistant treasurer of the corporation and may be sealed with
the seal of the corporation or a facsimile thereof.

      When the corporation is authorized to issue shares of more than one class
there shall be set forth upon the face or back of the certificate, or the
certificate shall have a statement that the corporation will furnish to any
shareholder upon request and without charge, a full statement of the
designation, relative rights, preferences, and limitations of the shares of each
class authorized to be issued and, if the corporation is authorized to issue any
class of preferred shares in series, the designation, relative rights,
preferences and limitations of each such series so far as the same have been
fixed and the authority of the board of directors to designate and fix the
relative rights, preferences and limitations of other series.

      Section 2. The signatures of the officers of the corporation upon a
certificate may be facsimiles if the certificate is countersigned by a
transfer agent or registered
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by a registrar other than the corporation itself or an employee of the
corporation. In case any officer who has signed or whose facsimile signature has
been placed upon a certificate shall have ceased to be such officer before such
certificate is issued, it may be issued by the corporation with the same effect
as if he were such officer at the date of issue.

                                LOST CERTIFICATES

      Section 3. The board of directors may direct a new certificate to be
issued in place of any certificate theretofore issued by the corporation alleged
to have been lost or destroyed. When authorizing such issue of a new
certificate, the board of directors, in its discretion and as a condition
precedent to the issuance thereof, may prescribe such terms and conditions as it
deems expedient, and may require such indemnities as it deems adequate, to
protect the corporation from any claim that may be made against it with respect
to any such certificate alleged to have been lost or destroyed.

                               TRANSFERS OF SHARES

      Section 4. Upon surrender to the corporation or the transfer agent of the
corporation of a certificate representing shares duly endorsed or accompanied by
proper evidence of succession, assignment or authority to transfer,
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a new certificate shall be issued to the person entitled thereto, and the old
certificate cancelled and the transaction recorded upon the books of the
corporation.

                               FIXING RECORD DATE

      Section 5. For the purpose of determining shareholders entitled to notice
of or to vote at any meeting of shareholders or any adjournment thereof, or to
express consent to or dissent from any proposal without a meeting, or for the
purpose of determining shareholders entitled to receive payment of any dividend
or the allotment of any rights, or for the purpose of any other action, the
board of directors may fix, in advance, a date as the record date for any such
determination of shareholders. Such date shall not be more than fifty nor less
than ten days before the date of any meeting nor more than fifty days prior to
any other action. When a determination of shareholders of record entitled to
notice of or to vote at any meeting of shareholders has been made as provided in
this section, such determination shall apply to any adjournment thereof, unless
the board fixes a new record date for the adjourned meeting.

                             REGISTERED SHAREHOLDERS

      Section 6. The corporation shall be entitled to recognize the exclusive
right of a person registered on its
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books as the owner of shares to receive dividends, and to vote as such owner,
and to hold liable for calls and assessments a person registered on its books as
the owner of shares, and shall not be bound to recognize any equitable or other
claim to or interest in such share or shares on the part of any other person,
whether or not it shall have express or other notice thereof, except as
otherwise provided by the laws of New York.

                              LIST OF SHAREHOLDERS

      Section 7. A list of shareholders as of the record date, certified by the
corporate officer responsible for its preparation or by a transfer agent, shall
be produced at any meeting upon the request thereat or prior thereto of any
shareholder. If the right to vote at any meeting is challenged, the inspectors
of election, or person presiding thereat, shall require such list of
shareholders to be produced as evidence of the right of the persons challenged
to vote at such meeting and all persons who appear from such list to be
shareholders entitled to vote thereat may vote at such meeting.

                                   ARTICLE XI

                               GENERAL PROVISIONS

                                    DIVIDENDS

      Section 1. Subject to the provisions of the certificate of incorporation
relating thereto, if any; dividends
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may be declared by the board of directors at any regular or special meeting,
pursuant to law. Dividends may be paid in cash, in shares of the capital stock
or in the corporation's bonds or its property, including the shares or bonds of
other corporations subject to any provisions of law and of the certificate of
incorporation.

      Section 2. Before payment of any dividend, there may be set aside out of
any funds of the corporation available for dividends such sum or sums as the
directors from time to time, in their absolute discretion, think proper as a
reserve fund to meet contingencies, or for equalizing dividends, or for
repairing or maintaining any property of the corporation, or for such other
purpose as the directors shall think conducive to the interest of the
corporation, and the directors may modify or abolish any such reserve in the
manner in which it was created.

                                     CHECKS

      Section 3. All checks or demands for money and notes of the corporation
shall be signed by such officer or officers or such other person or persons as
the board of directors may from time to time designate.

                                   FISCAL YEAR

      Section 4. The fiscal year of the corporation shall be fixed by resolution
of the board of directors.
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                                      SEAL

      Section 5. The corporate seal shall have inscribed thereon the name of the
corporation, the year of its organization and the words "Corporate Seal, New
York". The seal may be used by causing it or a facsimile thereof to be impressed
or affixed or in any manner reproduced.

                                   ARTICLE XII

                                   AMENDMENTS

      Section 1. These by-laws may be amended or repealed or new by-laws may be
adopted at any regular or special meeting of shareholders at which a quorum is
present or represented, by the vote of the holders of shares entitled to vote in
the election of any directors, provided notice of the proposed alteration,
amendment or repeal be contained in the notice of such meeting. These by-laws
may also be amended or repealed or new by-laws may be adopted by the affirmative
vote of a majority of the board of directors at any regular or special meeting
of the board. If any by-law regulating an impending election of directors is
adopted, amended or repealed by the board, there shall be set forth in the
notice of the next meeting of shareholders for the election of directors the
by-law so adopted, amended or repealed, together with precise statement of the
changes made. By-laws adopted by the board of directors may be amended or
repealed by the shareholders.