EXHIBIT 11

                          MARKWEST HYDROCARBON, INC.
                   COMPUTATION OF EARNINGS PER COMMON SHARE
                         (000s, except per share data)




                                                For the quarter ended      For the six months ended
                                                    June 30, 1999                June 30, 199
                                                ---------------------      ------------------------
                                                                     
Net income                                      $               577        $                 687

Weighted average number of outstanding
     shares of common stock                                   8,492                        8,485

Basic earnings per share                        $              0.07        $                0.08
                                               ======================      ========================
Net income                                      $               577        $                 687

Weighted average number of outstanding
     shares of common stock                                   8,492                        8,485
Dilutive stock options                                           11                            7
                                                ---------------------      ------------------------
                                                              8,503                        8,492

Earnings per share assuming dilution            $              0.07        $                0.08
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