Document:

EX-10.3

 Exhibit 10.3 

EXECUTION VERSION 
 VOTING AND
SUPPORT AGREEMENT 
 VOTING AND SUPPORT AGREEMENT, dated as of November 16, 2016 (this “Agreement”), by and among
Western Refining, Inc., a Delaware corporation (the “Company”), Tesoro Corporation, a Delaware Corporation (“Parent”), Tahoe Merger Sub 1, Inc., a Delaware corporation and a wholly-owned subsidiary of Parent
(“Merger Sub 1”), Tahoe Merger Sub 2, LLC, a Delaware limited liability company and a wholly-owned subsidiary of Parent (“Merger Sub 2”, and together with Merger Sub 1, “Merger Sub”) and Jeff A.
Stevens (the “Stockholder”). Capitalized terms used and not otherwise defined herein shall have the respective meanings ascribed to them in the Merger Agreement (as defined below). 

RECITALS 
 WHEREAS, as of
the date hereof, the Stockholder is the record and Beneficial Owner (as defined below) of the Existing Shares (as defined below), and has sole investment power over, the Existing Shares; 

WHEREAS, concurrently with the execution of this Agreement, Parent, Merger Sub and the Company have entered into an Agreement and Plan of
Merger, dated as of the date hereof (the “Merger Agreement”), pursuant to which, upon the terms and subject to the satisfaction or waiver of the conditions set forth in the Merger Agreement, Merger Sub 1 will be merged with and into
the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Parent; 
 WHEREAS, the
Stockholder has been provided with the execution copy of the Merger Agreement and acknowledges that the Stockholder will benefit directly and substantially from the consummation of the transactions contemplated thereby; 

WHEREAS, as a condition and inducement to the willingness of Parent and Merger Sub to enter into the Merger Agreement, Parent and Merger Sub
have required that the Stockholder agree to, and the Stockholder has agreed to, enter into this Agreement; 
 WHEREAS, as of the date hereof
and subject to the terms and conditions herein, the Stockholder has determined to vote in favor of the Merger and the transactions contemplated by the Merger Agreement and in furtherance thereof has agreed to enter into this Agreement. 

 NOW, THEREFORE, in consideration of the foregoing and the representations, warranties, covenants
and agreements contained herein, and intending to be legally bound hereby, the parties hereto hereby agree as follows: 
 1. Agreement to
Vote. 
 (a) From the date hereof until the Expiration Date, at every meeting of the stockholders of the Company called with respect to
any of the following, and at every adjournment or postponement thereof, and on every action or approval by written consent of the stockholders of the Company with respect to any of the following, the Stockholder hereby irrevocably and
unconditionally agrees to be present (in person or by proxy) and vote (or cause to be voted), or (with respect to any written consent solicitation) deliver (or cause to be delivered) a written consent with respect to, all of the Subject Shares: (A)
in favor of the adoption of the Merger Agreement and the approval of the transactions contemplated thereby, including the Merger, and any related proposal in furtherance thereof; (B) in favor of any proposal to adjourn or postpone the Company
Stockholder Meeting to a later date if there are not sufficient votes to adopt the Merger Agreement and/or if there are not sufficient shares present in person or by proxy at the Company Stockholder Meeting to constitute a quorum, (C) in favor of
any other matter necessary to consummate the transactions contemplated by the Merger Agreement and (D) against the following actions: (1) any merger, tender offer, exchange offer, sale of all or substantially all assets, recapitalization,
reorganization, consolidation, share exchange, business combination, liquidation, dissolution or similar transaction or series of transactions involving the Company, any of its Subsidiaries and any other Person (including any Acquisition Proposal),
other than the Merger and (2) any other action or agreement that would reasonably be expected to impede, frustrate, interfere with, delay, postpone or adversely affect the Merger or any other transaction contemplated by the Merger Agreement,
including the consummation thereof. 
 (b) At any meeting of the stockholders of the Company to which Section 1(a) above is
applicable, the Stockholder shall, or shall direct the holder(s) of record of all of the Subject Shares on any applicable record date to, appear, in person or by proxy, at each meeting or otherwise cause all of the Subject Shares to be counted as
present thereat for purposes of establishing a quorum. The Stockholder shall provide Parent with at least five (5) business days’ written notice prior to signing any action proposed to be taken by written consent with respect to any
Subject Shares. The obligations of the Stockholder under this Agreement, including this Section 1, shall apply whether or not an Adverse Company Recommendation Change has occurred. 

(c) Solely in the event of a failure by the Stockholder to act in accordance with its obligations pursuant to Section 1(a) and
Section 1(b) of this Agreement, and except as otherwise expressly provided herein, the Stockholder hereby irrevocably grants to and appoints Parent (and any designee thereof) as the Stockholder’s proxy and attorney-in-fact (with full
power of substitution), for and in the name, place and stead of the Stockholder, to (i) represent the Subject Shares and (ii) vote, execute written consents and otherwise act (by voting at any meeting of stockholders of the Company or otherwise)
with respect to the Subject Shares, in the case of each of clause (i) and clause (ii), regarding the matters referred to in Section 1(a) and Section 1(b) until, subject to Law, the Expiration Date, to the same extent and with the
same effect as the Stockholder could do under Law. The Stockholder intends the proxy granted pursuant to this Section 1(c) to be irrevocable and coupled with an interest and hereby revokes any proxy previously granted by the Stockholder with
respect to the Subject Shares. The Stockholder hereby ratifies and confirms all actions that the proxy appointed hereunder may lawfully do or cause to be done in accordance with 

  
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this Agreement. Notwithstanding the foregoing, this proxy shall automatically be revoked on the Expiration Date. Parent may terminate this proxy with respect to the Stockholder at any
time at its sole election by written notice provided to the Stockholder. The parties acknowledge and agree that neither Parent, nor any of its Affiliates, shall owe any duty (fiduciary or otherwise), or incur any liability of any kind to the
Stockholder or any of its Affiliates, in connection with or as a result of the exercise of the powers granted to Parent by this Section 1(c). 

(d) The following capitalized terms, as used in this Agreement, shall the meanings set forth below: 

(i) “Beneficial Owner” shall be interpreted in accordance with the term “beneficial owner” as
defined in Rule 13d-3 adopted by the SEC under the Exchange Act; provided that notwithstanding the generality of the foregoing, for purposes of determining Beneficial Ownership, a Person shall be deemed to be the Beneficial Owner of
any securities which such Person has, at any time during the term of this Agreement, the right to acquire pursuant to any agreement, arrangement or understanding or upon the exercise of conversion rights, exchange rights, warrants or options, or
otherwise (irrespective of whether the right to acquire such securities is exercisable immediately or only after the passage of time (including the passage of time in excess of sixty (60) days), the satisfaction of any conditions, the occurrence of
any event or any combination of the foregoing). The terms “Beneficial Ownership,” “Beneficially Own” and “Beneficially Owned” shall have correlative meanings. 

(ii) “Existing Shares” means, with respect to Stockholder, the number of Company Shares Beneficially Owned
and/or owned of record by Stockholder as of the date hereof, as set forth on Schedule A. 
 (iii) “Subject
Shares” means, with respect to Stockholder, Stockholder’s Existing Shares, together with any Company Shares or other voting capital stock of the Company of which Stockholder acquires Beneficial Ownership on or after the date hereof.

 2. Representations and Warranties of the Stockholder. The Stockholder hereby represents and warrants to Parent and Merger Sub
with respect to the Stockholder and the Stockholder’s ownership of the Subject Shares as follows: 
 (a) Authority. The
Stockholder has all requisite power and authority to enter into this Agreement and to consummate the transactions contemplated hereby. This Agreement has been duly authorized, executed and delivered by the Stockholder and constitutes a valid
and binding obligation of the Stockholder enforceable against the Stockholder in accordance with its terms, subject to the Bankruptcy and Equity Exception. Other than as provided in the Merger Agreement and except for any filings by Stockholder
with the Securities and Exchange Commission (the “SEC”) and compliance with the applicable requirements of the HSR Act, the execution, delivery and performance by the Stockholder of this Agreement does not require any action by or
in respect of, or any notice, report or other filing by the Stockholder with or to, or any consent, registration, approval, permit or authorization from, any Governmental Entity other than any actions or filings the absence of which would not
reasonably be expected to prevent, materially delay or materially impair the consummation of the transactions contemplated by the Merger Agreement or the Stockholder’s ability to observe and perform the Stockholder’s obligations
hereunder. 

  
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 (b) No Conflicts. Assuming compliance with the matters referred to in Section 2(a),
neither the execution and delivery of this Agreement, nor the consummation of the transactions contemplated hereby, nor compliance with the terms hereof, will (with or without notice or the passage of time or both) violate, conflict with or result
in a breach of, or constitute a default (with or without notice or lapse of time or both) under the Stockholder’s organizational documents or under any Contract of, or Law applicable to, the Stockholder or to the Stockholder’s property or
assets. 
 (c) The Subject Shares. The Stockholder is the sole record and beneficial owner of, or is a trust or estate that is
the sole record holder of and whose beneficiaries are the sole beneficial owners of, and has good and marketable title to, all of the Existing Shares, free and clear of any and all Liens and free of any other limitation or restriction (including any
restriction on the right to vote, sell or otherwise dispose of any Existing Shares), other than any of the foregoing that would not prevent, materially delay or materially impair, the consummation of the transactions contemplated by the Merger
Agreement or the Stockholder’s ability to observe and perform the Stockholder’s obligations hereunder. The Stockholder does not Beneficially Own or own of record any Company Shares other than the Existing Shares. The Stockholder
has, and will have at the time of each Company stockholders meeting occurring prior to the Merger with respect to the matters covered by Section 1(a), the sole right to vote and direct the vote of, and to dispose of and direct the disposition
of, the Subject Shares, and none of the Subject Shares is subject to any agreement, arrangement or restriction with respect to the Subject Shares that would prevent or delay the Stockholder’s ability to perform its obligations
hereunder. There are no agreements or arrangements of any kind, contingent or otherwise, obligating such Stockholder to Transfer (as defined below), or cause to be Transferred, any of the Existing Shares, and no Person has any contractual or
other right or obligation to purchase or otherwise acquire any of the Subject Shares. 
 (d) Reliance by Parent and Merger
Sub. The Stockholder understands and acknowledges that Parent and Merger Sub are entering into the Merger Agreement in reliance upon the Stockholder’s execution, delivery and performance of this Agreement and upon the representations
and warranties, covenants and other agreements of the Stockholder contained in this Agreement. 
 (e) Litigation. As of the date
hereof, there is no (i) action, proceeding or investigation pending or threatened against the Stockholder or any of its Affiliates; or (ii) outstanding Order to which the Stockholder or any of its Affiliates are subject or bound, in each case,
that would reasonably be expected to or seeks to prevent, materially delay, hinder or impair the exercise by Parent of its rights under this Agreement or the performance by the Stockholder of its obligations under this Agreement. 

  
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 (f) Other Agreements. Except for this Agreement, the Stockholder has not: (i) taken
any action that would or would reasonably be expected to (A) constitute or result in a breach hereof; (B) make any representation or warranty of the Stockholder set forth in this Section 2 untrue or incorrect; or (C) have the effect of
preventing or disabling the Stockholder from performing any of its obligations under this Agreement; (ii) granted any proxies or powers of attorney, or any other authorization or consent with respect to any of the Subject Shares with respect to the
matters set forth in Section 1(a); or (iii) deposited any of the Subject Shares into a separate voting trust or entered into a voting agreement or arrangement with respect to any of the Subject Shares. 

(g) Finders Fees. No broker, investment bank, financial advisor or other Person is entitled to any broker’s, finder’s,
financial adviser’s or similar fee or commission in connection with the transactions contemplated hereby based upon arrangements made by or on behalf of the Stockholder. 

(h) Stockholder Has Adequate Information. The Stockholder acknowledges that the Stockholder is a sophisticated investor with
respect to the Subject Shares and has adequate information concerning the business and financial condition of the Company to make an informed decision regarding the transactions contemplated by this Agreement and has, independently and without
reliance upon any of Parent, Merger Sub, the Company or any Affiliate of any of the foregoing, and based on such information as the Stockholder has deemed appropriate, made his or its own analysis and decision to enter into this Agreement. The
Stockholder acknowledges that none of Parent, Merger Sub, the Company or any Affiliate of any of the foregoing has made or is making any representation or warranty, whether express or implied, of any kind or character except as expressly set forth
in this Agreement. The Stockholder acknowledges that it has had the opportunity to seek independent legal advice prior to executing this Agreement. 

3. Representations and Warranties of Parent and Merger Sub. Each of Parent and Merger Sub has all requisite power and authority to
enter into this Agreement and to consummate the transactions contemplated hereby, subject only to (a) the adoption of the Merger Agreement by Parent as the sole stockholder or Merger Sub (which will occur promptly following execution of the Merger
Agreement) and (b) obtaining the Requisite Parent Vote. This Agreement has been duly authorized, executed and delivered by Parent and Merger Sub and constitutes a valid and binding obligation of Parent and Merger Sub enforceable against Parent
and Merger Sub in accordance with its terms, subject to the Bankruptcy and Equity Exception. Other than as provided in the Merger Agreement and any filings by Parent and Merger Sub with the SEC, the execution, delivery and performance by Parent
and Merger Sub of this Agreement does not require any consent, approval, authorization or permit of, action by, filing with or notification to any Governmental Entity, other than any consent, approval, authorization, permit, action, filing or
notification the failure of which to make or obtain would not, individually or in the aggregate, be reasonably expected to prevent or materially delay the consummation of the Merger. 

4. Restrictions on Transfer of Shares and Proxies. The Stockholder covenants and agrees that during the period from the date of this
Agreement through the Expiration Date, the Stockholder will not, directly or indirectly, (i) transfer, assign, sell, pledge, encumber, hypothecate or otherwise dispose of (whether by merger, by tendering into any tender or exchange offer, by
testamentary disposition, by operation of law or otherwise) or consent to any of the foregoing (“Transfer”), or cause to be Transferred, any of the Subject Shares; (ii) grant any proxies or powers of attorney, or any other
authorization or consent with respect to any or all of its Subject Shares in 

  
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respect of any matter addressed by this Agreement; (iii) deposit any of the Subject Shares into a voting trust or enter into a voting agreement or arrangement with respect to any of the Subject
Shares or grant any proxy or power of attorney with respect thereto that is inconsistent with this Agreement, (iv) enter into any Contract with respect to the Transfer of any Subject Shares; or (v) take any other action, that would restrict, limit
or interfere with the performance of the Stockholder’s obligations hereunder. The foregoing restrictions on Transfers of Subject Shares shall not prohibit any such Transfers by the Stockholder in connection with the transactions contemplated by
the Merger Agreement. Any purported Transfer of the Subject Shares in violation of this Section 4 shall be null and void ab initio.

5. Stop Transfer; Changes in Subject Shares. The Stockholder hereby agrees with, and covenants to, Parent that (a) this Agreement
and the obligations hereunder shall attach to the Subject Shares and shall be binding upon any Person or entity to which legal or Beneficial Ownership shall pass, whether by operation of Law or otherwise, including its successors or assigns; and (b)
such Stockholder shall not request that the Company register the transfer (book-entry or otherwise) of any certificate or uncertificated interest representing any or all of its Subject Shares. In the event of a stock split, stock dividend or
distribution, or any change in the Company Shares by reason of any split-up, reverse stock split, recapitalization, combination, reclassification, exchange of Company Shares or the like, the terms “Existing Shares” and “Subject
Shares” shall be deemed to refer to and include such Company Shares as well as all such stock splits, dividends and distributions and any securities into which or for which any or all of such Company Shares may be converted, changed or
exchanged or which are otherwise received in such transaction. 
 6. Documentation and Information. The Stockholder hereby (a)
consents to and authorizes the publication and disclosure by the Company, Parent and/or their respective Affiliates of its identity and holdings of the Subject Shares and the nature of its commitments and obligations under this Agreement in any
announcement, the Prospectus/Proxy Statement or any other disclosure document or filing with or notice to a Governmental Entity in connection with the Merger or any of the transactions contemplated by the Merger Agreement, and (b) agrees as promptly
as practicable to give to the Company and Parent any information it may reasonably require for the preparation of any such disclosure documents. The Stockholder hereby agrees to as promptly as practicable notify the Company and Parent of any
required corrections with respect to any written information supplied by the Stockholder specifically for use in any such disclosure document, filing or notice if and to the extent that any shall contain any untrue statement of material fact or omit
to state any material fact required to be stated therein or necessary in order to make the statements therein not misleading. The Stockholder hereby agrees to notify Parent in writing as promptly as practicable of the number of any additional
Subject Shares or other securities of the Company of which the Shareholder acquires Beneficial Ownership on or after the date hereof. Parent, the Merger Subs and the Company each hereby consent to and authorize the Stockholder and its
Affiliates, to the extent the Stockholder or such Affiliates determine it to be necessary or advisable under applicable Law, to publish and disclose in all documents and schedules filed with the SEC (including any amendment to the Stockholder’s
Schedule 13D) and all documents and schedules filed with the Federal Trade Commission or the Department of Justice, and any press release or other disclosure document or filing in connection with the Merger or any of the transactions contemplated by
the Merger Agreement or this Agreement, a copy of this Agreement, each of the other party’s identities and the nature of the Stockholder’s commitments and obligations under this Agreement. 

  
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 7. Waiver of Appraisal Rights. The Stockholder hereby waives, to the full extent of
the law, and agrees not to assert, any appraisal rights pursuant to Section 262 of the DGCL or otherwise in connection with the Merger with respect to any and all Subject Shares. 

8. Termination. This Agreement shall automatically terminate without further action upon the earliest to occur of (a) the
Effective Time and (b) the termination of the Merger Agreement in accordance with its terms (the date and time at which the earlier of clause (a) and clause (b) occurs being, the “Expiration Date”). Upon termination of this
Agreement, no party shall have any further obligations or liabilities under this Agreement; provided, however, that (i) nothing set forth in this Section 8 shall relieve any party from liability for any breach of this Agreement
occurring prior to the termination hereof; and (ii) the provisions of this Section 8 and Section 10 through Section 17 shall survive any termination of this Agreement. 

9. Further Assurances. Each party hereto shall execute and deliver such additional instruments and other documents and shall take
such further actions as may be necessary or desirable to effectuate, carry out and comply with all of the terms of this Agreement and the transactions contemplated thereby. 

10. Notices. Any notice, request, instruction or other document or communication to be given to any party hereunder shall
be in writing and delivered personally or sent by registered or certified mail, postage prepaid, or by facsimile, email or overnight courier: 

if to Parent or Merger Sub, to: 

Tesoro Corporation 
 19100
Ridgewood Parkway 
 San Antonio, TX 78259 

Attention: Kim Rucker 
 Fax:
Separately provided to the Company 
 E-mail: Separately provided to the Company 

(with a copy, which shall not constitute notice, to): 

Frank J. Aquila, Esq. 
 Audra D.
Cohen, Esq. 
 Sullivan & Cromwell LLP 

125 Broad St. 
 New York, NY
10004 
 Fax: (212) 558-3588 

E-mail: cohena@sullcrom.com 

     aquilaf@sullcrom.com 

  
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 if to the Company, to: 

Western Refining, Inc. 
 1250 W.
Washington Street 
 Suite 101 

Tempe, Arizona 85281 

Attention: Lowry Barfield 
 Fax:
Separately provided to Parent 
 E-mail: Separately provided to Parent 

(with a copy, which shall not constitute notice, to): 

John D. Amorosi, Esq. 
 Marc O.
Williams, Esq. 
 Davis Polk & Wardwell LLP 

450 Lexington Avenue 
 New York,
New York 10017 
 Fax: (212) 701-5010 

E-mail: john.amorosi@davispolk.com 

    marc.williams@davispolk.com 

if to the Stockholder, to: 
 Jeff
Stevens 
 1250 W. Washington 

#101 
 Facsimile No.: (602)
683-5604 
 E-mail: jeff.stevens@wnr.com 
 or
to such other persons or addresses as may be designated in writing by the party to receive such notice as provided above. Any notice, request, instruction or other document given as provided above shall be deemed given to the receiving party
upon actual receipt, if delivered personally; three (3) business days after deposit in the mail, if sent by registered or certified mail; upon telephonic or written confirmation of receipt (excluding out of office replies) if sent by facsimile or
email; or on the next business day after deposit with an overnight courier, if sent by an overnight courier. 
 11. Amendment, Waivers,
etc. 
 (a) Any provision of this Agreement may be amended or waived prior to the Effective Time if, but only if, such amendment or
waiver is in writing and is signed, in the case of an amendment, by each party to this Agreement or, in the case of a waiver, by each party against whom the waiver is to be effective. 

  
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 (b) No failure or delay by any party in exercising any right, power or privilege hereunder shall
operate as a waiver thereof nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any other right, power or privilege. The rights and remedies herein provided shall be cumulative and
not exclusive of any rights or remedies provided by Law. 
 12. Expenses. All costs and expenses incurred in connection with
this Agreement shall be paid by the party incurring such cost or expense. 
 13. Binding Effect; Benefit; Assignment. The
provisions of this Agreement shall be binding upon and shall inure solely to the benefit of the parties hereto and their respective successors and assigns and no provision of this Agreement is intended to, and no provision of this Agreement does,
confer any rights, benefits, remedies, obligations or liabilities hereunder upon any Person other than the parties hereto and their respective successors and assigns. No party may assign, delegate or otherwise transfer any of its rights or
obligations under this Agreement without the consent of each other party hereto. 
 14. Governing Law; Jurisdiction. 

(a) THIS AGREEMENT SHALL BE INTERPRETED, CONSTRUED AND GOVERNED BY AND IN ACCORDANCE WITH THE LAW OF THE STATE OF DELAWARE WITHOUT REGARD TO
THE CONFLICT OF LAW PRINCIPLES THEREOF TO THE EXTENT THAT SUCH PRINCIPLES WOULD HAVE THE EFFECT OF APPLYING THE LAWS OF, OR DIRECTING A MATTER TO, ANOTHER JURISDICTION.

(b) The parties hereby irrevocably submit to the personal jurisdiction of the courts of the State of Delaware and the Federal courts of the
United States of America located in the State of Delaware solely in respect of the interpretation and enforcement of the provisions of this Agreement and the Merger Agreement and of the documents referred to in this Agreement and the Merger
Agreement, and in respect of the transactions contemplated hereby and thereby, and hereby waive, and agree not to assert, as a defense in any action, suit or proceeding for the interpretation or enforcement of this Agreement or of any such document,
that it is not subject thereto or that such action, suit or proceeding may not be brought or is not maintainable in said courts or that the venue thereof may not be appropriate or that this Agreement, the Merger Agreement or any such document may
not be enforced in or by such courts, and the parties hereto irrevocably agree that all claims relating to such action, proceeding or transactions shall be heard and determined in such a Delaware State or Federal court. The parties hereby
consent to and grant any such court jurisdiction over the person of such parties and, to the extent permitted by Law, over the subject matter of such dispute and agree that mailing of process or other papers in connection with any such action or
proceeding in the manner provided in Section 10 or in such other manner as may be permitted by Law shall be valid and sufficient service thereof. 

15. WAIVER OF JURY TRIAL. EACH PARTY ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS AGREEMENT OR THE
MERGER AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND THEREFORE EACH SUCH PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY

  
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ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE MERGER AGREEMENT, OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT OR THE MERGER AGREEMENT. EACH PARTY CERTIFIES AND ACKNOWLEDGES THAT
(I) NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER, (II) EACH PARTY UNDERSTANDS AND HAS
CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (III) EACH PARTY MAKES THIS WAIVER VOLUNTARILY, AND (IV) EACH PARTY HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT AND THE MERGER AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN
THIS SECTION 15. 
 16. Counterparts. This Agreement may be executed in any number of counterparts,
each such counterpart being deemed to be an original instrument, and all such counterparts shall together constitute the same agreement. 

17. Entire Agreement. This Agreement constitutes the entire agreement, and supersedes all other prior agreements,
understandings, representations and warranties both written and oral, among the parties, with respect to the subject matter of this Agreement. 

18. Severability. The provisions of this Agreement shall be deemed severable and the invalidity or unenforceability of any
provision shall not affect the validity or enforceability of the other provisions of this Agreement. If any provision of this Agreement, or the application of such provision to any Person or any circumstance, is invalid or unenforceable, (a) a
suitable and equitable provision shall be substituted therefor in order to carry out, so far as may be valid and enforceable, the intent and purpose of such invalid or unenforceable provision and (b) the remainder of this Agreement and the
application of such provision to other Persons or circumstances shall not be affected by such invalidity or unenforceability, nor shall such invalidity or unenforceability affect the validity or enforceability of such provision, or the application
of such provision, in any other jurisdiction. 
 19. Specific Performance. The parties agree that irreparable damage would occur
in the event that any of the provisions of this Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed that the parties shall be entitled to an injunction or injunctions to
prevent breaches of this Agreement and to enforce specifically the terms and provisions of this Agreement in the Court of Chancery of the State of Delaware, this being in addition to any other remedy to which such party is entitled at Law or in
equity. 
 20. Joint Negotiation. The parties have participated jointly in negotiating and drafting this Agreement. In the
event that an ambiguity or a question of intent or interpretation arises, this Agreement shall be construed as if drafted jointly by the parties, and no presumption or burden of proof shall arise favoring or disfavoring any party by virtue of the
authorship of any provision of this Agreement. 
 [Remainder of page intentionally left blank] 

  
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 IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first above
written. 
  

			
		 	JEFF A. STEVENS
		
	By:	 	 /s/ Jeff A. Stevens

		 	Name: Jeff A. Stevens
		
		 	WESTERN REFINING, INC.
		
	By:	 	 /s/ Jeff A. Stevens

		 	Name: Jeff A. Stevens
		 	Title: Chief Executive Officer
		
		 	TESORO CORPORATION
		
	By:	 	 /s/ Gregory J. Goff

		 	Name: Gregory J. Goff
		 	 Title: Chairman of the Board of Directors,

          President and Chief Executive Officer

		
		 	TAHOE MERGER SUB 1, INC.
		
	By:	 	 /s/ Gregory J. Goff

		 	Name: Gregory J. Goff
		 	 Title: Chairman of the Board of Directors

          and President

		
		 	TAHOE MERGER SUB 2, LLC
		
	By:	 	 /s/ Gregory J. Goff

		 	Name: Gregory J. Goff
		 	 Title: Chairman of the Board of Directors

          and President

  
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 SCHEDULE A 
  

					
	 Name of Stockholder
	  	No. of
Company
Shares	 
	 Jeff A. Stevens
	  	 	3,556,456	  

  
 12EX-10.4

 Exhibit 10.4 

EXECUTION VERSION 
 VOTING AND
SUPPORT AGREEMENT 
 VOTING AND SUPPORT AGREEMENT, dated as of November 16, 2016 (this “Agreement”), by and among
Western Refining, Inc., a Delaware corporation (the “Company”), Tesoro Corporation, a Delaware Corporation (“Parent”), Tahoe Merger Sub 1, Inc., a Delaware corporation and a wholly-owned subsidiary of Parent
(“Merger Sub 1”), Tahoe Merger Sub 2, LLC, a Delaware limited liability company and a wholly-owned subsidiary of Parent (“Merger Sub 2”, and together with Merger Sub 1, “Merger Sub”) and Scott D.
Weaver (the “Stockholder”). Capitalized terms used and not otherwise defined herein shall have the respective meanings ascribed to them in the Merger Agreement (as defined below). 

RECITALS 
 WHEREAS, as of
the date hereof, the Stockholder is the record and Beneficial Owner (as defined below) of the Existing Shares (as defined below), and has sole investment power over, the Existing Shares; 

WHEREAS, concurrently with the execution of this Agreement, Parent, Merger Sub and the Company have entered into an Agreement and Plan of
Merger, dated as of the date hereof (the “Merger Agreement”), pursuant to which, upon the terms and subject to the satisfaction or waiver of the conditions set forth in the Merger Agreement, Merger Sub 1 will be merged with and into
the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Parent; 
 WHEREAS, the
Stockholder has been provided with the execution copy of the Merger Agreement and acknowledges that the Stockholder will benefit directly and substantially from the consummation of the transactions contemplated thereby; 

WHEREAS, as a condition and inducement to the willingness of Parent and Merger Sub to enter into the Merger Agreement, Parent and Merger Sub
have required that the Stockholder agree to, and the Stockholder has agreed to, enter into this Agreement; 
 WHEREAS, as of the date hereof
and subject to the terms and conditions herein, the Stockholder has determined to vote in favor of the Merger and the transactions contemplated by the Merger Agreement and in furtherance thereof has agreed to enter into this Agreement. 

 NOW, THEREFORE, in consideration of the foregoing and the representations, warranties, covenants
and agreements contained herein, and intending to be legally bound hereby, the parties hereto hereby agree as follows: 
 1. Agreement to
Vote. 
 (a) From the date hereof until the Expiration Date, at every meeting of the stockholders of the Company called with respect to
any of the following, and at every adjournment or postponement thereof, and on every action or approval by written consent of the stockholders of the Company with respect to any of the following, the Stockholder hereby irrevocably and
unconditionally agrees to be present (in person or by proxy) and vote (or cause to be voted), or (with respect to any written consent solicitation) deliver (or cause to be delivered) a written consent with respect to, all of the Subject Shares: (A)
in favor of the adoption of the Merger Agreement and the approval of the transactions contemplated thereby, including the Merger, and any related proposal in furtherance thereof; (B) in favor of any proposal to adjourn or postpone the Company
Stockholder Meeting to a later date if there are not sufficient votes to adopt the Merger Agreement and/or if there are not sufficient shares present in person or by proxy at the Company Stockholder Meeting to constitute a quorum, (C) in favor of
any other matter necessary to consummate the transactions contemplated by the Merger Agreement and (D) against the following actions: (1) any merger, tender offer, exchange offer, sale of all or substantially all assets, recapitalization,
reorganization, consolidation, share exchange, business combination, liquidation, dissolution or similar transaction or series of transactions involving the Company, any of its Subsidiaries and any other Person (including any Acquisition Proposal),
other than the Merger and (2) any other action or agreement that would reasonably be expected to impede, frustrate, interfere with, delay, postpone or adversely affect the Merger or any other transaction contemplated by the Merger Agreement,
including the consummation thereof. 
 (b) At any meeting of the stockholders of the Company to which Section 1(a) above is
applicable, the Stockholder shall, or shall direct the holder(s) of record of all of the Subject Shares on any applicable record date to, appear, in person or by proxy, at each meeting or otherwise cause all of the Subject Shares to be counted as
present thereat for purposes of establishing a quorum. The Stockholder shall provide Parent with at least five (5) business days’ written notice prior to signing any action proposed to be taken by written consent with respect to any
Subject Shares. The obligations of the Stockholder under this Agreement, including this Section 1, shall apply whether or not an Adverse Company Recommendation Change has occurred. 

(c) Solely in the event of a failure by the Stockholder to act in accordance with its obligations pursuant to Section 1(a) and
Section 1(b) of this Agreement, and except as otherwise expressly provided herein, the Stockholder hereby irrevocably grants to and appoints Parent (and any designee thereof) as the Stockholder’s proxy and attorney-in-fact (with full
power of substitution), for and in the name, place and stead of the Stockholder, to (i) represent the Subject Shares and (ii) vote, execute written consents and otherwise act (by voting at any meeting of stockholders of the Company or otherwise)
with respect to the Subject Shares, in the case of each of clause (i) and clause (ii), regarding the matters referred to in Section 1(a) and Section 1(b) until, subject to Law, the Expiration Date, to the same extent and with the
same effect as the Stockholder could do under Law. The Stockholder intends the proxy granted pursuant to this Section 1(c) to be irrevocable and coupled with an interest and hereby revokes any proxy previously granted by the Stockholder with
respect to the Subject Shares. The Stockholder hereby ratifies and confirms all actions that the proxy appointed hereunder may lawfully do or cause to be done in accordance with 

  
 2 

 
this Agreement. Notwithstanding the foregoing, this proxy shall automatically be revoked on the Expiration Date. Parent may terminate this proxy with respect to the Stockholder at any
time at its sole election by written notice provided to the Stockholder. The parties acknowledge and agree that neither Parent, nor any of its Affiliates, shall owe any duty (fiduciary or otherwise), or incur any liability of any kind to the
Stockholder or any of its Affiliates, in connection with or as a result of the exercise of the powers granted to Parent by this Section 1(c). 

(d) The following capitalized terms, as used in this Agreement, shall the meanings set forth below: 

(i) “Beneficial Owner” shall be interpreted in accordance with the term “beneficial owner” as
defined in Rule 13d-3 adopted by the SEC under the Exchange Act; provided that notwithstanding the generality of the foregoing, for purposes of determining Beneficial Ownership, a Person shall be deemed to be the Beneficial Owner of
any securities which such Person has, at any time during the term of this Agreement, the right to acquire pursuant to any agreement, arrangement or understanding or upon the exercise of conversion rights, exchange rights, warrants or options, or
otherwise (irrespective of whether the right to acquire such securities is exercisable immediately or only after the passage of time (including the passage of time in excess of sixty (60) days), the satisfaction of any conditions, the occurrence of
any event or any combination of the foregoing). The terms “Beneficial Ownership,” “Beneficially Own” and “Beneficially Owned” shall have correlative meanings. 

(ii) “Existing Shares” means, with respect to Stockholder, the number of Company Shares Beneficially Owned
and/or owned of record by Stockholder as of the date hereof, as set forth on Schedule A. 
 (iii) “Subject
Shares” means, with respect to Stockholder, Stockholder’s Existing Shares, together with any Company Shares or other voting capital stock of the Company of which Stockholder acquires Beneficial Ownership on or after the date hereof.

 2. Representations and Warranties of the Stockholder. The Stockholder hereby represents and warrants to Parent and Merger Sub
with respect to the Stockholder and the Stockholder’s ownership of the Subject Shares as follows: 
 (a) Authority. The
Stockholder has all requisite power and authority to enter into this Agreement and to consummate the transactions contemplated hereby. This Agreement has been duly authorized, executed and delivered by the Stockholder and constitutes a valid
and binding obligation of the Stockholder enforceable against the Stockholder in accordance with its terms, subject to the Bankruptcy and Equity Exception. Other than as provided in the Merger Agreement and except for any filings by Stockholder
with the Securities and Exchange Commission (the “SEC”) and compliance with the applicable requirements of the HSR Act, the execution, delivery and performance by the Stockholder of this Agreement does not require any action by or
in respect of, or any notice, report or other filing by the Stockholder with or to, or any consent, registration, approval, permit or authorization from, any Governmental Entity other than any actions or filings the absence of which would not
reasonably be expected to prevent, materially delay or materially impair the consummation of the transactions contemplated by the Merger Agreement or the Stockholder’s ability to observe and perform the Stockholder’s obligations
hereunder. 

  
 3 

 (b) No Conflicts. Assuming compliance with the matters referred to in Section 2(a),
neither the execution and delivery of this Agreement, nor the consummation of the transactions contemplated hereby, nor compliance with the terms hereof, will (with or without notice or the passage of time or both) violate, conflict with or result
in a breach of, or constitute a default (with or without notice or lapse of time or both) under the Stockholder’s organizational documents or under any Contract of, or Law applicable to, the Stockholder or to the Stockholder’s property or
assets. 
 (c) The Subject Shares. The Stockholder is the sole record and beneficial owner of, or is a trust or estate that is
the sole record holder of and whose beneficiaries are the sole beneficial owners of, and has good and marketable title to, all of the Existing Shares, free and clear of any and all Liens and free of any other limitation or restriction (including any
restriction on the right to vote, sell or otherwise dispose of any Existing Shares), other than any of the foregoing that would not prevent, materially delay or materially impair, the consummation of the transactions contemplated by the Merger
Agreement or the Stockholder’s ability to observe and perform the Stockholder’s obligations hereunder. The Stockholder does not Beneficially Own or own of record any Company Shares other than the Existing Shares. The Stockholder
has, and will have at the time of each Company stockholders meeting occurring prior to the Merger with respect to the matters covered by Section 1(a), the sole right to vote and direct the vote of, and to dispose of and direct the disposition
of, the Subject Shares, and none of the Subject Shares is subject to any agreement, arrangement or restriction with respect to the Subject Shares that would prevent or delay the Stockholder’s ability to perform its obligations
hereunder. There are no agreements or arrangements of any kind, contingent or otherwise, obligating such Stockholder to Transfer (as defined below), or cause to be Transferred, any of the Existing Shares, and no Person has any contractual or
other right or obligation to purchase or otherwise acquire any of the Subject Shares. 
 (d) Reliance by Parent and Merger
Sub. The Stockholder understands and acknowledges that Parent and Merger Sub are entering into the Merger Agreement in reliance upon the Stockholder’s execution, delivery and performance of this Agreement and upon the representations
and warranties, covenants and other agreements of the Stockholder contained in this Agreement. 
 (e) Litigation. As of the date
hereof, there is no (i) action, proceeding or investigation pending or threatened against the Stockholder or any of its Affiliates; or (ii) outstanding Order to which the Stockholder or any of its Affiliates are subject or bound, in each case,
that would reasonably be expected to or seeks to prevent, materially delay, hinder or impair the exercise by Parent of its rights under this Agreement or the performance by the Stockholder of its obligations under this Agreement. 

  
 4 

 (f) Other Agreements. Except for this Agreement, the Stockholder has not: (i) taken
any action that would or would reasonably be expected to (A) constitute or result in a breach hereof; (B) make any representation or warranty of the Stockholder set forth in this Section 2 untrue or incorrect; or (C) have the effect of
preventing or disabling the Stockholder from performing any of its obligations under this Agreement; (ii) granted any proxies or powers of attorney, or any other authorization or consent with respect to any of the Subject Shares with respect to the
matters set forth in Section 1(a); or (iii) deposited any of the Subject Shares into a separate voting trust or entered into a voting agreement or arrangement with respect to any of the Subject Shares. 

(g) Finders Fees. No broker, investment bank, financial advisor or other Person is entitled to any broker’s, finder’s,
financial adviser’s or similar fee or commission in connection with the transactions contemplated hereby based upon arrangements made by or on behalf of the Stockholder. 

(h) Stockholder Has Adequate Information. The Stockholder acknowledges that the Stockholder is a sophisticated investor with
respect to the Subject Shares and has adequate information concerning the business and financial condition of the Company to make an informed decision regarding the transactions contemplated by this Agreement and has, independently and without
reliance upon any of Parent, Merger Sub, the Company or any Affiliate of any of the foregoing, and based on such information as the Stockholder has deemed appropriate, made his or its own analysis and decision to enter into this Agreement. The
Stockholder acknowledges that none of Parent, Merger Sub, the Company or any Affiliate of any of the foregoing has made or is making any representation or warranty, whether express or implied, of any kind or character except as expressly set forth
in this Agreement. The Stockholder acknowledges that it has had the opportunity to seek independent legal advice prior to executing this Agreement. 

3. Representations and Warranties of Parent and Merger Sub. Each of Parent and Merger Sub has all requisite power and authority to
enter into this Agreement and to consummate the transactions contemplated hereby, subject only to (a) the adoption of the Merger Agreement by Parent as the sole stockholder or Merger Sub (which will occur promptly following execution of the Merger
Agreement) and (b) obtaining the Requisite Parent Vote. This Agreement has been duly authorized, executed and delivered by Parent and Merger Sub and constitutes a valid and binding obligation of Parent and Merger Sub enforceable against Parent
and Merger Sub in accordance with its terms, subject to the Bankruptcy and Equity Exception. Other than as provided in the Merger Agreement and any filings by Parent and Merger Sub with the SEC, the execution, delivery and performance by Parent
and Merger Sub of this Agreement does not require any consent, approval, authorization or permit of, action by, filing with or notification to any Governmental Entity, other than any consent, approval, authorization, permit, action, filing or
notification the failure of which to make or obtain would not, individually or in the aggregate, be reasonably expected to prevent or materially delay the consummation of the Merger. 

4. Restrictions on Transfer of Shares and Proxies. The Stockholder covenants and agrees that during the period from the date of this
Agreement through the Expiration Date, the Stockholder will not, directly or indirectly, (i) transfer, assign, sell, pledge, encumber, hypothecate or otherwise dispose of (whether by merger, by tendering into any tender or exchange offer, by
testamentary disposition, by operation of law or otherwise) or consent to any of the foregoing (“Transfer”), or cause to be Transferred, any of the Subject Shares; (ii) grant any proxies or powers of attorney, or any other
authorization or consent with respect to any or all of its Subject Shares in 

  
 5 

 
respect of any matter addressed by this Agreement; (iii) deposit any of the Subject Shares into a voting trust or enter into a voting agreement or arrangement with respect to any of the Subject
Shares or grant any proxy or power of attorney with respect thereto that is inconsistent with this Agreement, (iv) enter into any Contract with respect to the Transfer of any Subject Shares; or (v) take any other action, that would restrict, limit
or interfere with the performance of the Stockholder’s obligations hereunder. The foregoing restrictions on Transfers of Subject Shares shall not prohibit any such Transfers by the Stockholder in connection with the transactions contemplated by
the Merger Agreement. Any purported Transfer of the Subject Shares in violation of this Section 4 shall be null and void ab initio.

5. Stop Transfer; Changes in Subject Shares. The Stockholder hereby agrees with, and covenants to, Parent that (a) this Agreement
and the obligations hereunder shall attach to the Subject Shares and shall be binding upon any Person or entity to which legal or Beneficial Ownership shall pass, whether by operation of Law or otherwise, including its successors or assigns; and (b)
such Stockholder shall not request that the Company register the transfer (book-entry or otherwise) of any certificate or uncertificated interest representing any or all of its Subject Shares. In the event of a stock split, stock dividend or
distribution, or any change in the Company Shares by reason of any split-up, reverse stock split, recapitalization, combination, reclassification, exchange of Company Shares or the like, the terms “Existing Shares” and “Subject
Shares” shall be deemed to refer to and include such Company Shares as well as all such stock splits, dividends and distributions and any securities into which or for which any or all of such Company Shares may be converted, changed or
exchanged or which are otherwise received in such transaction. 
 6. Documentation and Information. The Stockholder hereby (a)
consents to and authorizes the publication and disclosure by the Company, Parent and/or their respective Affiliates of its identity and holdings of the Subject Shares and the nature of its commitments and obligations under this Agreement in any
announcement, the Prospectus/Proxy Statement or any other disclosure document or filing with or notice to a Governmental Entity in connection with the Merger or any of the transactions contemplated by the Merger Agreement, and (b) agrees as promptly
as practicable to give to the Company and Parent any information it may reasonably require for the preparation of any such disclosure documents. The Stockholder hereby agrees to as promptly as practicable notify the Company and Parent of any
required corrections with respect to any written information supplied by the Stockholder specifically for use in any such disclosure document, filing or notice if and to the extent that any shall contain any untrue statement of material fact or omit
to state any material fact required to be stated therein or necessary in order to make the statements therein not misleading. The Stockholder hereby agrees to notify Parent in writing as promptly as practicable of the number of any additional
Subject Shares or other securities of the Company of which the Shareholder acquires Beneficial Ownership on or after the date hereof. Parent, the Merger Subs and the Company each hereby consent to and authorize the Stockholder and its
Affiliates, to the extent the Stockholder or such Affiliates determine it to be necessary or advisable under applicable Law, to publish and disclose in all documents and schedules filed with the SEC (including any amendment to the Stockholder’s
Schedule 13D) and all documents and schedules filed with the Federal Trade Commission or the Department of Justice, and any press release or other disclosure document or filing in connection with the Merger or any of the transactions contemplated by
the Merger Agreement or this Agreement, a copy of this Agreement, each of the other party’s identities and the nature of the Stockholder’s commitments and obligations under this Agreement. 

  
 6 

 7. Waiver of Appraisal Rights. The Stockholder hereby waives, to the full extent of
the law, and agrees not to assert, any appraisal rights pursuant to Section 262 of the DGCL or otherwise in connection with the Merger with respect to any and all Subject Shares. 

8. Termination. This Agreement shall automatically terminate without further action upon the earliest to occur of (a) the
Effective Time and (b) the termination of the Merger Agreement in accordance with its terms (the date and time at which the earlier of clause (a) and clause (b) occurs being, the “Expiration Date”). Upon termination of this
Agreement, no party shall have any further obligations or liabilities under this Agreement; provided, however, that (i) nothing set forth in this Section 8 shall relieve any party from liability for any breach of this Agreement
occurring prior to the termination hereof; and (ii) the provisions of this Section 8 and Section 10 through Section 17 shall survive any termination of this Agreement. 

9. Further Assurances. Each party hereto shall execute and deliver such additional instruments and other documents and shall take
such further actions as may be necessary or desirable to effectuate, carry out and comply with all of the terms of this Agreement and the transactions contemplated thereby. 

10. Notices. Any notice, request, instruction or other document or communication to be given to any party hereunder shall
be in writing and delivered personally or sent by registered or certified mail, postage prepaid, or by facsimile, email or overnight courier: 

if to Parent or Merger Sub, to: 

Tesoro Corporation 
 19100
Ridgewood Parkway 
 San Antonio, TX 78259 

Attention: Kim Rucker 
 Fax:
Separately provided to the Company 
 E-mail: Separately provided to the Company 

(with a copy, which shall not constitute notice, to): 

Frank J. Aquila, Esq. 
 Audra D.
Cohen, Esq. 
 Sullivan & Cromwell LLP 

125 Broad St. 
 New York, NY
10004 
 Fax: (212) 558-3588 

E-mail: cohena@sullcrom.com 

 aquilaf@sullcrom.com 

  
 7 

 if to the Company, to: 

Western Refining, Inc. 
 1250 W.
Washington Street 
 Suite 101 

Tempe, Arizona 85281 

Attention: Lowry Barfield 
 Fax:
Separately provided to Parent 
 E-mail: Separately provided to Parent 

(with a copy, which shall not constitute notice, to): 

John D. Amorosi, Esq. 
 Marc O.
Williams, Esq. 
 Davis Polk & Wardwell LLP 

450 Lexington Avenue 
 New York,
New York 10017 
 Fax: (212) 701-5010 

E-mail: john.amorosi@davispolk.com 

            marc.williams@davispolk.com 

if to the Stockholder, to: 

Scott Weaver 
 123 W. Mills 

#600 
 Facsimile No.: (915)
504-7099 
 E-mail: scott.weaver@wnr.com 
 or
to such other persons or addresses as may be designated in writing by the party to receive such notice as provided above. Any notice, request, instruction or other document given as provided above shall be deemed given to the receiving party
upon actual receipt, if delivered personally; three (3) business days after deposit in the mail, if sent by registered or certified mail; upon telephonic or written confirmation of receipt (excluding out of office replies) if sent by facsimile or
email; or on the next business day after deposit with an overnight courier, if sent by an overnight courier. 
 11. Amendment, Waivers,
etc. 
 (a) Any provision of this Agreement may be amended or waived prior to the Effective Time if, but only if, such amendment or
waiver is in writing and is signed, in the case of an amendment, by each party to this Agreement or, in the case of a waiver, by each party against whom the waiver is to be effective. 

  
 8 

 (b) No failure or delay by any party in exercising any right, power or privilege hereunder shall
operate as a waiver thereof nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any other right, power or privilege. The rights and remedies herein provided shall be cumulative and
not exclusive of any rights or remedies provided by Law. 
 12. Expenses. All costs and expenses incurred in connection with
this Agreement shall be paid by the party incurring such cost or expense. 
 13. Binding Effect; Benefit; Assignment. The
provisions of this Agreement shall be binding upon and shall inure solely to the benefit of the parties hereto and their respective successors and assigns and no provision of this Agreement is intended to, and no provision of this Agreement does,
confer any rights, benefits, remedies, obligations or liabilities hereunder upon any Person other than the parties hereto and their respective successors and assigns. No party may assign, delegate or otherwise transfer any of its rights or
obligations under this Agreement without the consent of each other party hereto. 
 14. Governing Law; Jurisdiction. 

(a) THIS AGREEMENT SHALL BE INTERPRETED, CONSTRUED AND GOVERNED BY AND IN ACCORDANCE WITH THE LAW OF THE STATE OF DELAWARE WITHOUT REGARD TO
THE CONFLICT OF LAW PRINCIPLES THEREOF TO THE EXTENT THAT SUCH PRINCIPLES WOULD HAVE THE EFFECT OF APPLYING THE LAWS OF, OR DIRECTING A MATTER TO, ANOTHER JURISDICTION.

(b) The parties hereby irrevocably submit to the personal jurisdiction of the courts of the State of Delaware and the Federal courts of the
United States of America located in the State of Delaware solely in respect of the interpretation and enforcement of the provisions of this Agreement and the Merger Agreement and of the documents referred to in this Agreement and the Merger
Agreement, and in respect of the transactions contemplated hereby and thereby, and hereby waive, and agree not to assert, as a defense in any action, suit or proceeding for the interpretation or enforcement of this Agreement or of any such document,
that it is not subject thereto or that such action, suit or proceeding may not be brought or is not maintainable in said courts or that the venue thereof may not be appropriate or that this Agreement, the Merger Agreement or any such document may
not be enforced in or by such courts, and the parties hereto irrevocably agree that all claims relating to such action, proceeding or transactions shall be heard and determined in such a Delaware State or Federal court. The parties hereby
consent to and grant any such court jurisdiction over the person of such parties and, to the extent permitted by Law, over the subject matter of such dispute and agree that mailing of process or other papers in connection with any such action or
proceeding in the manner provided in Section 10 or in such other manner as may be permitted by Law shall be valid and sufficient service thereof. 

15. WAIVER OF JURY TRIAL. EACH PARTY ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS AGREEMENT OR THE
MERGER AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND THEREFORE EACH SUCH PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY

  
 9 

 
ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE MERGER AGREEMENT, OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT OR THE MERGER AGREEMENT. EACH PARTY CERTIFIES AND ACKNOWLEDGES THAT
(I) NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER, (II) EACH PARTY UNDERSTANDS AND HAS
CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (III) EACH PARTY MAKES THIS WAIVER VOLUNTARILY, AND (IV) EACH PARTY HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT AND THE MERGER AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN
THIS SECTION 15. 
 16. Counterparts. This Agreement may be executed in any number of counterparts,
each such counterpart being deemed to be an original instrument, and all such counterparts shall together constitute the same agreement. 

17. Entire Agreement. This Agreement constitutes the entire agreement, and supersedes all other prior agreements,
understandings, representations and warranties both written and oral, among the parties, with respect to the subject matter of this Agreement. 

18. Severability. The provisions of this Agreement shall be deemed severable and the invalidity or unenforceability of any
provision shall not affect the validity or enforceability of the other provisions of this Agreement. If any provision of this Agreement, or the application of such provision to any Person or any circumstance, is invalid or unenforceable, (a) a
suitable and equitable provision shall be substituted therefor in order to carry out, so far as may be valid and enforceable, the intent and purpose of such invalid or unenforceable provision and (b) the remainder of this Agreement and the
application of such provision to other Persons or circumstances shall not be affected by such invalidity or unenforceability, nor shall such invalidity or unenforceability affect the validity or enforceability of such provision, or the application
of such provision, in any other jurisdiction. 
 19. Specific Performance. The parties agree that irreparable damage would occur
in the event that any of the provisions of this Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed that the parties shall be entitled to an injunction or injunctions to
prevent breaches of this Agreement and to enforce specifically the terms and provisions of this Agreement in the Court of Chancery of the State of Delaware, this being in addition to any other remedy to which such party is entitled at Law or in
equity. 
 20. Joint Negotiation. The parties have participated jointly in negotiating and drafting this Agreement. In the
event that an ambiguity or a question of intent or interpretation arises, this Agreement shall be construed as if drafted jointly by the parties, and no presumption or burden of proof shall arise favoring or disfavoring any party by virtue of the
authorship of any provision of this Agreement. 
 [Remainder of page intentionally left blank] 

  
 10 

 IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first above
written. 
  

			
		 	SCOTT D. WEAVER
		
	By:	 	 /s/ Scott D. Weaver

		 	Name: Scott D. Weaver
		
		 	WESTERN REFINING, INC.
		
	By:	 	 /s/ Jeff A. Stevens

		 	Name: Jeff A. Stevens
		 	Title: Chief Executive Officer
		
		 	TESORO CORPORATION
		
	By:	 	 /s/ Gregory J. Goff

		 	Name: Gregory J. Goff
		 	 Title: Chairman of the Board of Directors,

          President and Chief Executive Officer

		
		 	TAHOE MERGER SUB 1, INC.
		
	By:	 	 /s/ Gregory J. Goff

		 	Name: Gregory J. Goff
		 	 Title: Chairman of the Board of Directors

          and President

		
		 	TAHOE MERGER SUB 2, LLC
		
	By:	 	 /s/ Gregory J. Goff

		 	Name: Gregory J. Goff
		 	 Title: Chairman of the Board of Directors

          and President

  
 11 

 SCHEDULE A 
  

					
	 Name of Stockholder
	  	No. of
Company
Shares	 
	 Scott D. Weaver
	  	 	1,307,229	  

  
 12

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