When I first did the tires/lift the ride was really squirrelly with poor tracking. This, I discovered, was tire pressure related. The tire dealer wanted me to run 50 to 55psi in my GY w/silent armor because they were LT tires vs. P rated tires. I lowered the pressure to 38psi and the ride went...
With stock tires I averaged 280-290 miles before fuel light on my first 4 or 5 tanks. With upgrade to 285/70 17’s with Donahoe lift I have been averaging 250-260 miles till fuel light. Fill-up’s have been between 14.5 and 16 gals.