Can some one tell me what rpm's there running at 75 or 80 mph? I want to add some 315-70-17 bfg a/t and I do alot of hwy driving. Will they add any pep to the truck or just make it feel stock. Also from what I've seen these tires should fit with stock wheels. Anyone running this setup? What's your mpg? (05 4x4 4.6 auto 2" leveling kit)

 

just did a 1100 mile trip at 80mph the whole way...2400rpm.

gives way more pep than the stock ratio.

 

What kind of gas mileage did you get?