MarkWest Energy Partners, L.P.
Calculation of Earnings to Fixed Charges
(Dollar amounts in thousands)

		Year ended December 31,

		2006			2007			2008			2009			2010
Total fixed charges		$	54,153		$	49,191		$	86,559		$	112,981		$	120,711

Earnings:
Earnings from continuing operations before income taxes		$	74,498		$	(59,155	)	$	273,602		$	(155,370	)	$	34,291
Add:
	Fixed charges		54,153			49,191			86,559			112,981			120,711
	Amortization of capitalized interest		255			478			1,110			1,444			1,583
	Cash distributions from equity method investments		—			10,840			445			—			2,508
	Income from equity method investments		(5,316	)		(5,309	)		(90	)		(3,505	)		(1,562	)
Subtract:
	Interest capitalized		(900	)		(3,344	)		(9,486	)		(12,228	)		(2,766	)

Total earnings		$	122,690		$	(7,299	)	$	352,140		$	(56,678	)	$	154,765

Ratio			2.27			(0.15	)		4.07			(0.50	)		1.28