Exhibit 23.10 LETTER OF CONSENT We consent to the reference to our firm name in this Registration Statement on Form S-4 of Devon Financing Corporation, U.L.C. and Devon Energy Corporation and the reference to our firm name and our reports providing estimates of a portion of the natural gas, natural gas liquids and conventional oil reserves of Anderson Exploration Ltd. as of March 31, 2000 and September 30, 2000 herein. Yours very truly, GILBERT LAUSTSEN JUNG ASSOCIATES LTD. /s/ Dana B. Laustsen ------------------------------------- Dana B. Laustsen, P. Eng. Executive Vice President Calgary, Alberta December 14, 2001