17-18 with my crew cab silverado 4.8 V-8 pulling a bass tracker i got the same motor in my '07 silverado. i've got a g3 that's probably about the same weight as your tracker. do you use your tow/haul switch when you're towing? i know it uses more gas when you do, but will it wear on the transmission more if you don't use it? all my roads are flat except for 2 overpasses on the highway. all the rest are rural and back roads.
