I'm considering going ahead with a gear change on my truck. It currently has 3.73 gears and simply needs more bottom end. My current tires are 31.6" diameter (265/75-16). My next tires will be 32.8" (285/75-16 or 305/70-16). Of course this will exaggerate an already existing problem. With that in mind, should I go with 4.10 or 4.56 gears? I'm performance oriented but don't want to forget about mileage. What kind of RPMs will I turn and how bad will it impact my mileage, one vs the other? Check my sig for my setup.