Check your tire air pressure.
I want good fuel mileage, but I don't want to wear out a set of tires prematurely either. I'll try 65 and keep an eye on how they wear. Thanks.If you want max fuel mileage run em at 65.
I run my fronts at 80 psi and rears at 65 with 10 ply tires (rear feel like it skates with 475rwhp @ WOT at all speeds with 80psi in the rear).
I also have a 2wd truck.