I love this truck. My Suburban has the 6.2 liter diesel motor which makes it great on fuel usage. I average about 20 mpg, with or without a load. I've been able to pull upwards of 15,000 lbs behind my Suburban. We added a 4 inch lift, 35 inch tires, Kennworth long haul semi seats, a Warn winch and Warn winch bumper to the front of my truck. It's a beast and is nearly impossible to kill.