originally ordered a '22 Lariat Tremor, and yesterday changed it to a Lariat FX4 (both 6.7L diesel w/3.55 gear ratio)....Chip didn't know the answer so i figured i'd ask you since i just noticed you're on this forum. I am going to buy the 3.55 gear ratio, regardless which one I will buy. I assumed the 18 wheels/33 inch tires would get around 2 mpg better than the Tremor 20 inch wheels/35 inch tires. Can you verify if the mpg would be different? Thanks man.