

Tesoro Corporation Announces Change to First Quarter 2008 Earnings Release Date
Tesoro Corporation (NYSE:TSO) today said that it will release earnings for the first quarter of 2008 on Tuesday evening, May 6th. The company will hold a conference call at 7:30 a.m., CDT, Wednesday, May 7th regarding first quarter 2008 results. Interested parties may listen to the live conference call over the Internet by logging on to Tesoro's Internet site at http://www.tsocorp.com.
The company is moving its previously announced release date in order to include first quarter results as a part of the annual shareholder meeting being held on Tuesday, May 6th at 5:00 p.m. CDT at the Grand Hyatt San Antonio, Texas. A copy of the presentation will be available at www.tsocorp.com coinciding with the start of the meeting.
Tesoro Corporation, a Fortune 150 Company, is an independent refiner and marketer of petroleum products. Tesoro, through its subsidiaries, operates seven refineries in the western United States with a combined capacity of approximately 660,000 barrels per day. Tesoro's retail-marketing system includes over 900 branded retail stations, of which over 445 are company operated under the Tesoro®, Shell®, Mirastar® and USA GasolineTM brands.
Mike Marcy
Tesoro Corporation
voice: (210) 626-4697
19100 Ridgewood Parkway
San Antonio, TX 78259
George.M.Marcy@tsocorp.com