Exhibit 23.3 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in this Registration Statement on Form S-4 of CorvettePorsche Corp. of our report dated March 9, 2001 relating to the consolidated financial statements of Tosco Corporation, which appears in the Current Report on Form 8-K/A of Phillips Petroleum Company, dated October 31, 2001. PricewaterhouseCoopers LLP Phoenix, Arizona December 7, 2001