Purchased 2002 HD 2500 DA crew cab in Jan 05 LOVE THAT TRUCK getting 18 average empty around Texas.Came to Colorado towing 28ft. Jayco got 12mpg towing trailer. purchased Predator installed 2nd highest economy tune getting 20 mpg average.went from Grand Junction to Ft. Collins about 600 miles average 21 mpg best I have done so far. Haven't tried towing yet. EGT got around 1200 going over Vail and Loveland passes had to ease off of cruise to maintain EGTs