Texas XC Quad Racer
Join Date: Jul 2005
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My truck, 38" tires and 4.56 gears, I get 15.5 mpg on the highway and 14 in town and an SCT programmer
My truck, when I had 35" tires and stock 3.73's, I got 20.7 mpg on the highway and 18 in town and an Edge module.
I run 4.56's and they're as low as I'd want with 38's, in fact, I'd rather have 4.30's. Reason I went with 4.56's is in case I want 40's in the future. 35's with 3.73's are a perfect combo, just a little hard on an auto trans. I would go with 4.10's at most with 35's unless you plan on going bigger. These trucks mpg's are affected by rpm more than tire size, IMO. The torque these things produce don't notice the tire weight as much, mileage wise, as it does keeping the revs way up there.
Black 03 F250 Crew Cab 4x4 Shortbed Lariat - studded 6.0, sunroof, MBRP muff-less exhaust, SCT tuning, JW trans, Cobalts, lifted, ProComp Xtreme ATs, 4.56 gears, High-Angle CV Driveline, Warn 15k, AmpSteps, stainless brake lines, Powerslots /Hawk, AGR pump/gearbox/ram, projector headlamps and one heavy foot....
Audio: Kenwood DDX-8017 in-dash TV/DVD/GPS, kickpanel pods, MB Quart 1" tweets/5.25"mids in kicks, 6.5" midbass in doors, rear MB Quart 6x8, Fosgate amps / 3000 watts, 3 - JL 10w6's. Fully Dynamatted and foamed interior.