EXHIBIT 11

                          MarkWest Hydrocarbon, Inc.
                   Computation of Earnings per Common Share
                         (000s, except per share data)


 
 
                                 FOR THE THREE MONTHS  FOR THE SIX MONTHS
                                    ENDED JUNE 30,       ENDED JUNE 30,
                                   1997       1996       1997      1996
                               ------------------------------------------
 
                                                     
Net income (a)                      $  300     $  195    $4,582    $2,783
 
Weighted average common              8,484      7,908     8,484     7,908
   shares outstanding (a)
 
Earnings per common share (a)       $ 0.04     $ 0.02    $ 0.54    $ 0.35
 
(a) Pro forma for 1996