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Strategic Actions Update Exchange of GP economic interests completes the announced plan Announced December 15, 2017 and expected to close Feb. 1, 2018 subject to the completion of refining logistics assets and fuels distribution services dropdown – Transaction represents one of the fastest paths to accretion compared with similar GP transactions • Result of rapid growth of GP/IDR cash flows in status-quo scenario – Expected to be accretive to MPLX distributable cash flow (“DCF”) attributable to common unitholders on a per unit basis in the third quarter and for the full year 2018 • Exchanges MPLX GP/IDR cash distribution requirements to MPC for limited partner unit distributions • Compares pre and post exchange on DCF per unit available to common unitholders basis • Pre-exchange basis allocates to LP DCF the maximum amount which is distributable per partnership agreement • In the high splits, total excess cash flow is allocated equally to LP and GP DCF - beyond actual distributions • Post exchange basis eliminates the fully distributed GP/IDR take which results in an increase to total cash flow allocated to LP DCF – Supports attractive long-term distribution growth rate and lower cost of capital for MPLX • Continue to forecast double-digit distribution growth for 2018 All transactions subject to closing conditions including tax and other regulatory clearances.