Exhibit 11 TESORO PETROLEUM CORPORATION AND SUBSIDIARIES INFORMATION SUPPORTING EARNINGS (LOSS) PER SHARE COMPUTATIONS (Unaudited) (In thousands except per share amounts) Three Months Ended Nine Months Ended September 30, September 30, 1995 1994 1995 1994 ------------------ ----------------- PRIMARY EARNINGS (LOSS) PER SHARE COMPUTATION Earnings (loss) before extraordinary item . . . . . $ 36,782 ( 3,263) 45,998 5,169 Extraordinary loss on extinguishment of debt. . . . - - - ( 4,752) --------- --------- --------- --------- Net earnings (loss) . . . . . . . . . . . . . . . . 36,782 ( 3,263) 45,998 417 Less dividend requirements on preferred stocks. . . - - - 2,680 --------- --------- --------- --------- Net earnings (loss) applicable to common stock. . $ 36,782 ( 3,263) 45,998 ( 2,263) ========= ========= ========= ========= Average outstanding common shares . . . . . . . . . 24,542 24,381 24,531 21,933 Average outstanding common equivalent shares. . . . 551 630 609 651 --------- --------- --------- --------- Average outstanding common and common equivalent shares . . . . . . . . . . . . . . . 25,093 25,011 25,140 22,584 ========= ========= ========= ========= Primary Earnings (Loss) Per Share: Earnings (loss) before extraordinary item . . . . $ 1.47 ( .13) 1.83 .11 Extraordinary loss on extinguishment of debt. . . - - - ( .21) --------- --------- --------- --------- Net earnings (loss) . . . . . . . . . . . . . . $ 1.47 ( .13) 1.83 ( .10) ========= ========= ========= ========= FULLY DILUTED EARNINGS (LOSS) PER SHARE COMPUTATION Net earnings (loss) applicable to common stock. . . $ 36,782 ( 3,263) 45,998 ( 2,263) Add dividend requirements on preferred stocks . . . - - - 2,680 --------- --------- --------- --------- Net earnings (loss) applicable to common stock - fully diluted . . . . . . . . . . . . $ 36,782 ( 3,263) 45,998 417 ========= ========= ========= ========= Average outstanding common and common equivalent shares . . . . . . . . . . . . . . . . 25,093 25,011 25,140 22,584 Shares issuable on conversion of preferred shares . - - - 1,973 --------- --------- --------- --------- Fully diluted shares. . . . . . . . . . . . . . . 25,093 25,011 25,140 24,557 ========= ========= ========= ========= Fully Diluted Earnings (Loss) Per Share - Anti-dilutive<F1> . . . . . . . . . . . . . . . . $ 1.47 ( .13) 1.83 ( .10) ========= ========= ========= ========= <FN> <F1> This calculation is submitted in accordance with paragraph 601(b)(11) of Regulation S-K although it is not required by APB Opinion No. 15 because it produces an anti-dilutive result.