EXHIBIT 11

                           MARKWEST HYDROCARBON, INC.
                    COMPUTATION OF EARNINGS PER COMMON SHARE
                          (000S, EXCEPT PER SHARE DATA)



                                                 FOR THE QUARTER ENDED    FOR THE NINE MONTHS ENDED
                                                   SEPTEMBER 30, 1999        SEPTEMBER 30, 1999
                                                 ---------------------    -------------------------
                                                                    
Net income                                              $   59                    $  746
Weighted average number of outstanding
  shares of common stock                                  8473                     8,481
Basic earnings per share                                $ 0.01                    $ 0.09
                                                        ======                    ======
Net income                                              $   59                    $  746
Weighted average number of outstanding
  shares of common stock                                  8473                     8,481
Dilutive stock options                                       6                         7
                                                        ------                    ------
                                                          8479                     8,488
Earnings per share assuming dilution                    $ 0.01                    $ 0.09
                                                        ======                    ======