My 7.3 PSD in my sig gets around 14-15 mpg on average, thats mostly city with some hwy. The 4.10's don't help on the hwy and the bigger rims and tires don't help around town. Gonna be swapping gears for 3.55's and going to stock size tires. The Falkens (my least favorite tire brand) have no grip whatsoever in the rain.... or any other surface for that matter. "All terrains" my ( )( )