EXHIBIT 11    


                                                          
                                                        
                       TOSCO CORPORATION AND SUBSIDIARIES
                      COMPUTATION OF EARNINGS PER SHARE (a)
                                   (Unaudited)
                  (Thousands of Dollars, Except Per Share Data)
                                                                                                                       
                                                               Three Months Ended September 30,   Nine Months Ended September 30, 
                                                                      1997            1996              1997            1996    
                                                                     -------        ---------          ---------      --------- 
                                                                                                          
 Income before distributions on company-obligated, mandatorily                                                                
   redeemable, convertible preferred securities                   $103,456          $42,493            $179,176       $116,097 
 Distributions on company-obligated, mandatorily redeemable,                                                                      
   convertible preferred securities, net of income tax benefit       2,523            -                   7,569          -
                                                                  ----------       ----------          -----------    ---------  
                                                        
 Net income                                                       $100,933          $42,493            $171,607       $116,097 
                                                                  -----------      ----------          -----------    ---------
                                                        
     PRIMARY EARNINGS PER SHARE                                                     
                                                        
 Earnings used for computation of primary earnings per share      $100,933          $42,493            $171,607       $116,097 
                                                                 ============     ==========          ===========    =========
 Weighted average number of shares outstanding 
   during the period                                           156,185,661      130,851,153         146,617,794    119,196,819 
 Assumed conversion of common share equivalents                  4,424,517        2,974,680           4,301,608      2,778,525 
                                                               ---------------  ------------        ------------   ------------
 Weighted average common and common equivalent shares used                                                      
   for computation of primary earnings per share               160,610,178      133,825,833         150,919,402    121,975,344 
                                                              ----------------  ------------       -------------   -------------
 Primary earnings per common and common equivalent share        $     0.63         $   0.32          $     1.14        $  0.95 
                                                              ================  ============       =============   ==============
                                                        
 FULLY DILUTED EARNINGS PER SHARE                                                       
                                                        
 Earning used for computation of fully diluted 
   earnings per share                                           $  103,456        $ 42,493           $  179,176      $ 116,097 
                                                              ----------------  ------------       --------------   -------------- 
 Weighted average number of shares outstanding 
   during the period                                           156,185,661     130,851,153          146,617,794    119,196,819 
 Assumed conversion of common share equivalents                  4,648,105       3,323,658            4,648,105      3,323,661 
 Assumed conversion of company-obligated, mandatorily                                                         
   redeemable, convertible preferred securities                  9,113,940                            9,113,940            
                                                              ---------------- -------------       --------------- ----------------
 Weighted average common and common equivalent shares used                                                      
   for computation of fully diluted earnings per share         169,947,706     134,174,811          160,379,839    122,520,480 
                                                              --------------   --------------      ---------------  ---------------
 Fully diluted earnings per common and common equivalent share       $0.61           $0.32                 $1.12         $0.95 
                                                              ==============   ==============      ===============  ===============
                                                        
 (a)  Earnings per share and weighted average shares outstanding reflect the 
      3-for-1 stock split declared and distributed in February 1997.