<ARTICLE>  5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM TESORO
PETROLEUM CORPORATION'S FINANCIAL STATEMENTS AS OF AND FOR THE THREE MONTH
PERIOD ENDED MARCH 31, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>  1,000

                                        
<PERIOD-TYPE>                                     3-MOS
<FISCAL-YEAR-END>                           DEC-31-2000
<PERIOD-END>                                MAR-31-2000
<CASH>                                           21,000
<SECURITIES>                                          0
<RECEIVABLES>                                   310,900
<ALLOWANCES>                                      1,600
<INVENTORY>                                     268,300
<CURRENT-ASSETS>                                609,600
<PP&E>                                          984,800
<DEPRECIATION>                                  254,300
<TOTAL-ASSETS>                                1,471,600
<CURRENT-LIABILITIES>                           340,400
<BONDS>                                         352,500
<PREFERRED-MANDATORY>                                 0
<PREFERRED>                                     165,000
<COMMON>                                          5,400
<OTHER-SE>                                      452,500
<TOTAL-LIABILITY-AND-EQUITY>                  1,471,600
<SALES>                                       1,054,700
<TOTAL-REVENUES>                              1,055,300
<CGS>                                         1,011,400
<TOTAL-COSTS>                                 1,011,400
<OTHER-EXPENSES>                                 10,500
<LOSS-PROVISION>                                      0
<INTEREST-EXPENSE>                                9,600
<INCOME-PRETAX>                                  15,300
<INCOME-TAX>                                      6,000
<INCOME-CONTINUING>                               9,300
<DISCONTINUED>                                        0
<EXTRAORDINARY>                                       0
<CHANGES>                                             0
<NET-INCOME>                                      9,300
<EPS-BASIC>                                        0.20
<EPS-DILUTED>                                      0.20
<FN>