My stock 02 tahoe gets 15 driveing 30 miles to town and decent town driving when im there, my truck (in sig) iv never even tryed to see but I know its better, I bet its 16-17 if i stay out of it with maybe 70 percent hiway miles, thats rolling 2700 rpm at 70 with a yank ss 4000 stall. vary much happy with the milage it gets, it dont seem right that my toy does better then my daily.