Was getting around 11-12 before the 2" drop and have seen it go to 14.4 first tank after drop with no other changes. This is a 4x4 so I guess the height really does effect the drag of the truck. May go 1 more inch a little later. If I can keep it in the 14-15 range I'm good. It gets what the old rc rt was getting and this is a crew cab and 4x4.