As another statistical information point, I had a '99 Suburban 2500 / 3/4 ton, with big block Vortec 454, 4L80E, 3.73 gears, 33" BFG all terrain tires & 'autotragic' 4x4 for about 6 years. I admit I have a heavy right foot, but mileage was pretty abysmal: I got 9-10 mpg on the highway, not towing, medium loaded. That said, other than having to replace the transfer case & a few other odds & ends (like a starter, alternator, plug wires, battery, door lock actuators), it was a pretty reliable & comfortable vehicle. I got the 2500 for the big block, stronger frame, beefier gearbox & better brakes for the times when I wanted it to tow & general greater reliability of the heavier duty components. The 'burb went on countless 'missions' & road trips to Baja & all over the Pacific Southwest, snowboarding, running heavy sweep at rally races on fire roads, etc. & the countless great memories associated with them. I'd probably still have it, but I upgraded to a '00 7.3L PSD Excursion with off road mods that I wanted, and couldn't justify keeping two large SUVs that filled somewhat the same purpose.