6.0 4l80e fuel mileage?

[skoffice]

My dad has an AWD Yukon and he gets about the same, maybe a little less, with a 5.3. 12 in town, 17 on freeway. My buddy on the other hand, had a short regular cab 2wd 04 sierra with a 4.8 and auto, and he would AVG. 19 mpg and I kid you not, he drove that damn thing like it was a racecar! Manually shifting the auto everywhere he went just so he could hear his exhaust (cutout) rev. I know it's a smaller engine but probably a comparable truck weight wise. He had 3.73's and 20's on 40 series tires.