4.56 at 1900 would get you 49 MPH. That is gonna cost you. That is what I have and it dropped the mileage. 80 mph is now at 3000 rpm and 16 mpg. 2500 is about 63 mph.
RK 3.5 X factor w/ 2.0 RK shocks and T/F Speed Bumps, Currie Correctlync with flip, EVO under armor, 44 Magnum sleeves and gussets with JPI t/case skid, Rock Hard evap relocation, Tom Woods 1350 Driveshafts, 4.56 gears, Viair OBA, AEV rear skid and Pro Cal, RCV axles, 35" KM2 tires on 17" MB Black Razors, Cobra 75 radio. RSE electric sliders, SPOD.