Yesterday, I made a 600 mile round trip to pick up my son for spring break and drove into a 20-30 mph headwind on the way there. Results...12 mpg. Driving back on the same afternoon with the same wind as a tailwind.....20mpg. Basically the terrain was flat as a board and no change in altitude.
On the way back, it was very quiet, very smooth, and very easy.
Driving into the tailwind, it was noisy, loud, and a lot of wind buffeting with about 400 more rpm on the engine (same gear) to maintain the same speed. 285 BFG tires, lift, Gobi rack, lights, and ARB probably dont help much for improving wind resistance.
And I STILL wouldnt trade this thing for anything on the road or off it.