Exhibit 12.1

MARATHON PETROLEUM CORPORATION

Computation of Ratio of Earnings to Fixed Charges

TOTAL ENTERPRISE BASIS – Unaudited

(In millions)

	For the Years Ended December 31,
	2011		2010		2009		2008		2007
Portion of rentals representing interest	$	41	$	45	$	41	$	43	$	38
Capitalized interest		114		83		78		60		9
Other interest and fixed charges		60		1		1		1		1
Total fixed charges (A)	$	215	$	129	$	120	$	104	$	48
Earnings-pretax income with applicable adjustments (B)	$	3,848	$	1,063	$	748	$	1,986	$	3,456
Ratio of (B) to (A)		17.9		8.2		6.2		19.1		72.0