Exhibit 23.1 [Letterhead of PricewaterhouseCoopers LLP] To the Board of Directors of Clark Refining & Marketing, Inc.: We consent to the inclusion in this registration statement on Form S-4 of our report dated February 4, 1997 on our audits of the consolidated financial statements of Clark Refining & Marketing, Inc. We also consent to the reference to our Firm under the caption "Experts". PricewaterhouseCoopers LLP St. Louis, Missouri September 25, 1998