EX-23 2 ex23s.htm EXHIBIT 23 ex23s.htm

Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

 
We consent to the incorporation by reference in Registration Statement No. 333-59290 of Frontier Oil Corporation on Form S-8 of our report dated June 26, 2007, appearing in the Annual Report on Form 11-K of Frontier Retirement Savings Plan for the year ended December 31, 2006.
 
 
DELOITTE & TOUCHE LLP
 
Denver, Colorado
June 26, 2007