EXHIBIT 23.4 CONSENT OF MILLER AND LENTS, LTD. We consent to the incorporation by reference in this Registration Statement of Devon Energy Corporation on Form S-8 the reference to our review performed for Ocean Energy, Inc. as of December 31, 2002, 2001 and 2000, which appears in Devon Energy Corporation's current report on Form 8-K, filed with the Securities Exchange Commission on April 25, 2003. MILLER AND LENTS, LTD. By: /s/ GREGORY W. ARMES ---------------------------------- Gregory W. Armes Senior Vice-President April 30, 2003