Exhibit 23.6

745 Seventh Avenue New York, NY 10019 United States

May 25, 2018

CONSENT OF BARCLAYS CAPITAL INC.

We hereby consent to (i) the inclusion of our opinion letter, dated April 29, 2018, to the Board of Directors of Marathon Petroleum Corporation (the “Company”), as an Annex to the joint proxy statement/prospectus that forms a part of the Registration Statement on Form S-4 of the Company, as filed by the Company on May 25, 2018 (the “Registration Statement”), relating to the proposed business combination transaction between the Company and Andeavor and (ii) the references in the Registration Statement to such opinion and our firm in the Registration Statement under the headings “Summary—Opinions of Financial Advisors,” “Risk Factors,” “The Merger—Background of the Merger,” “The Merger—Recommendation of the MPC Board and Reasons for the Merger,” “The Merger—Opinion of Barclays, MPC’s Financial Advisor,” “The Merger—Unaudited Forecasted Financial Information,” “Annex A—Merger Agreement” and “Annex C—Opinion of Barclays Capital Inc.”

In giving such consent, we do not admit that we come within the category of persons whose consent is required under Section 7 of the U.S. Securities Act of 1933, as amended, or the rules and regulations adopted by the U.S. Securities and Exchange Commission thereunder, nor do we admit that we are experts with respect to any part of the Registration Statement within the meaning of the term “experts” as used in the U.S. Securities Act of 1933, as amended, or the rules and regulations of the U.S. Securities and Exchange Commission thereunder.

Very truly yours,

BARCLAYS CAPITAL INC.

By: /s/ Andrew B. Steinau

Name:	Andrew B. Steinau
Title:	Managing Director