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)

	Six Months Ended June 30, 2014		For the Years Ended December 31,
			2013		2012		2011		2010		2009
Portion of rentals representing interest	$	37	$	71	$	46	$	41	$	45	$	41
Capitalized interest		13		28		101		112		83		78
Other interest and fixed charges		85		167		90		60		1		1
Total fixed charges (A)		135		266		237		213		129		120
Earnings-pretax income with applicable adjustments (B)		1,742		3,518		5,423		3,848		1,063		748
Ratio of (B) to (A)		12.9		13.2		22.9		18.1		8.2		6.2