Marathon Oil (MRO) 10-Q 2005 Q3 Quarterly report

Exhibit 12.2

Marathon Oil Corporation

Computation of Ratio of Earnings to Fixed Charges

TOTAL ENTERPRISE BASIS - Unaudited

(Dollars in Millions)

	Nine Months Ended September 30				Year Ended December 31
	2005		2004		2004		2003		2002		2001		2000
Portion of rentals representing interest	$	45	$	42	$	57	$	63	$	66	$	54	$	50
Capitalized interest, including discontinued operations	73		34		48		41		16		27		19
Other interest and fixed charges, including discontinued operations	175		206		279		270		316		349		375
Total fixed charges (A)	$	293	$	282	$	384	$	374	$	398	$	430	$	444
Earnings-pretax income with applicable adjustments (B)	$	3,332	$	1,981	$	2,843	$	2,422	$	1,446	$	3,365	$	1,884
Ratio of (B) to (A)	11.37		7.02		7.40		6.48		3.63		7.83		4.24