My JL 2.0 is always mid 20’s running like 40% interstate. I’ll run 70-75 on the slab. Just remember that adding big tires adds a ton to unstrung weight And adds drag. You have to work to get those bad boys spinning and that take fuel. Lifting more than likely also increases drag on a vehicle that already has the aerodynamics of a brick. Put your foot in it to accelerate quickly and again, it burns a good bit of fuel.. My previous Wranglers were all low teens regardless of how it was driven (and that on stock tires()..