POWER OF ATTORNEY


	KNOW ALL PERSONS BY THESE PRESENTS, that Michael E. Wiley
constitutes and appoints Charles S. Parrish and Jean M. Mosel, and each of
them, as his/her true and lawful attorney-in-fact and agent for him/her and
in his/her name, place and stead, in any and all capacities, to sign any or
all Forms 3, 4, and 5 relating to equity securities of Tesoro Petroleum
Corporation (the  "Company") pursuant to the requirements of Section 16 of the
Securities Exchange Act of 1934, and to file the same with the Securities and
Exchange Commission and the New York Stock Exchange, granting unto said
attorney-in-fact and agent full power and authority to do and perform each
and every act and thing requisite and necessary to be done in about the
premises, as fully to all intents and purposes as he/she might or could do in
person, hereby ratifying and affirming all that said attorney-in-fact and
agent may lawfully do or cause to be done by virtue hereof.  This
authorization, unless earlier revoked by the undersigned in writing, shall be
valid until the undersigned's reporting obligations under Section 16 with
respect to equity securities of the Company shall cease.


Date:   March 30, 2005



						____________________________________
					       	Michael E. Wiley