yeah I had low expectations, it was just worse than expected. I used GPS so the cruise was set at an honest 88 and calculated the MPG manually using the NAV. I knew the level and 33's wasn't going to help it any LOL! I just bought this truck to replace my trusty 06' Silverado SS (2wd), it would get 17mpg driving it hard through the mountains....different animal though..
Used Bilsteins for 1.8" up front coupled with 275/60/20 Dura Tracs on my stock rims, really happy with the ride, MPG's with the cruise set at 88mph was terrible though....
New to me 16' Sierra SLE 5.3 4WD Z71 with some nice equipment. I put Bilstein ride height adjustable shocks up front to level her with 275/60/20 Dura Tracs. Was just up in Iowa with it and she had no problem in getting through my uncles snow covered fields out to his cabin!