EXHIBIT 11 MARKWEST HYDROCARBON, INC. COMPUTATION OF EARNINGS PER COMMON SHARE (000s, EXCEPT PER SHARE DATA) FOR THE YEAR ENDED DECEMBER 31, 2000 ------------------ Net income $8,878 Weighted average number of outstanding shares of common stock 8,452 Basic earnings per share $ 1.05 ====== Net income $8,878 Weighted average number of outstanding shares of common stock 8,452 Dilutive stock options 40 ------ 8,492 Earnings per share assuming dilution $ 1.05 ======