MarkWest Energy Partners, L.P.
Calculation of Earnings to Fixed Charges

(Dollar amounts in thousands)

			Year ended December 31,

			2004			2005			2006			2007			2008
Fixed Charges				17,192			34,080			54,153			49,191			86,559
Earnings				22,942			28,221			122,690			(7,299	)		352,140
Add:
	(a)	Pre-tax income from continuing operations		6,490			(8,515	)		74,498			(59,155	)		273,602
	(b)	Fixed charges		17,192			34,080			54,153			49,191			86,559
	(c)	Amortization of capitalized interest		53			195			255			478			1,110
	(d)	Distributed income of equity investees		—			2,441			—			10,840			445
	(e)	Share of pre-tax losses (earnings) of equity investees		—			2,153			(5,316	)		(5,309	)		(90	)
Subtract:
	(a)	Interest capitalized		(793	)		(2,133	)		(900	)		(3,344	)		(9,486	)

Equals Earnings				22,942			28,221			122,690			(7,299	)		352,140

Ratio				1.33			0.83			2.27			(0.15	)		4.07