1 EXHIBIT 12.1 TESORO PETROLEUM CORPORATION Computation of Ratio of Earnings to Fixed Charges (Dollars in thousands) Three Months Ended Years Ended December 31, March 31, ---------------------------------------------------- ----------------- 1997 1996 1995 1994 1993 1997 1998 -------- -------- -------- -------- -------- ------- ------- EARNINGS: Earnings before income taxes and extraordinary loss on extinguishments of debt, net .................... $ 49,120 $115,147 $ 61,868 $ 26,056 $ 18,653 $ 9,575 $10,890 Interest expense, net of capitalized interest ......... 6,699 15,128 20,166 17,890 12,661 1,570 2,665 Amortization of debt discount ......................... -- 254 736 859 1,889 -- -- Amortization of debt issuance costs ................... -- 257 350 332 195 -- -- Estimated interest portion of rents (a) ............... 11,509 9,185 5,908 5,248 4,487 3,406 2,910 -------- -------- -------- -------- -------- ------- ------- Total Earnings ................................ $ 67,328 $139,971 $ 89,028 $ 50,385 $ 37,885 $14,551 $16,465 ======== ======== ======== ======== ======== ======= ======= FIXED CHARGES: Interest expenses, whether expensed or capitalized .... $ 7,118 $ 15,128 $ 20,166 $ 18,805 $ 12,661 $ 1,570 $ 2,665 Amortization of debt discount ......................... -- 254 736 859 1,889 -- -- Amortization of debt issuance costs ................... -- 257 350 332 195 -- -- Estimated interest portion of rents (a) ............... 11,509 9,185 5,908 5,248 4,487 3,406 2,910 -------- -------- -------- -------- -------- ------- ------- Total Fixed Charges ........................... $ 18,627 $ 24,824 $ 27,160 $ 25,244 $ 19,232 $ 4,976 $ 5,575 ======== ======== ======== ======== ======== ======= ======= PREFERRED STOCK DIVIDEND REQUIREMENTS .................... $ -- $ -- $ -- $ 2,680 $ 9,207 -- -- ======== ======== ======== ======== ======== ======= ======= COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDEND REQUIREMENTS ................................. $ 18,627 $ 24,824 $ 27,160 $ 27,924 $ 28,439 $ 4,976 $ 5,575 ======== ======== ======== ======== ======== ======= ======= RATIO OF EARNINGS TO FIXED CHARGES ....................... 3.61 5.64 3.28 2.00 1.97 2.92 2.95 ======== ======== ======== ======== ======== ======= ======= RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDEND REQUIREMENTS ................. 3.61 5.64 3.28 1.80 1.33 2.92 2.95 ======== ======== ======== ======== ======== ======= ======= - ---------- (a) For a majority of leases, the interest portion of rents was estimated by using the Company's incremental borrowing rate in effect at the inception of the leases. For the remaining leases, interest expense was estimated by using one third of the rental payments. Total rental expense, including marine charters, was $44.9 million, $41.5 million, $35.6 million, $33.6 million and $32.5 million for the years ended December 31, 1997, 1996, 1995, 1994 and 1993, respectively, and $11.7 million and $12.3 million for the three months ended March 31, 1997 and 1998, respectively.