Marathon Petroleum (MPC) 8-K Other Events

Exhibit 12.1

Marathon Petroleum Corporation

Computation of Ratio of Earnings to Fixed Charges

TOTAL ENTERPRISE BASIS – Unaudited

(In millions)

	Nine Months Ended September 30, 2015		For the Years Ended December 31,
			2014		2013		2012		2011		2010
Portion of rentals representing interest	$	79	$	85	$	71	$	46	$	41	$	45
Capitalized interest		27		27		28		101		112		83
Other interest and fixed charges		199		201		167		90		60		1
Total fixed charges (A)		305		313		266		237		213		129
Earnings-pretax income with applicable adjustments (B)		4,468		4,194		3,518		5,423		3,848		1,063
Ratio of (B) to (A)		14.6		13.4		13.2		22.9		18.1		8.2