Exhibit 23.1
Consent of independent registered public accounting firm
We consent to the incorporation by reference in this Registration Statement onForm S-3 of our report dated February 28, 2008 (October 21, 2008 as to Note Q), relating to the consolidated financial statements of Tesoro Corporation and subsidiaries (which report expressed an unqualified opinion and included an explanatory paragraph relating to a change in the method of accounting for refined product sales and purchases transactions with the same counterparty that have been entered into in contemplation of one another, and for its pension and other postretirement plans) appearing in the Annual Report onForm 10-K of Tesoro Corporation for the year ended December 31, 2008 and to the reference to us under the heading “Experts” in the Prospectus, which is part of this Registration Statement.
DELOITTE & TOUCHE LLP
Houston, Texas
June 1, 2009
