MPG!!!!!!! READ
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I'm on 40's and 4.56s and the other mods in my sig, and My overhead never goes below 17mpg, Hand calculated I'm around 15mpg average. When I moved last september, I drove 1200 miles most of which I drove around 75mph, and was between 15-16mpg, hand calculated, the entire trip. When I had 37's I was averaging 19mpg, and the overhead would be around 21-22mpg. My overhead is usually around 2mpg higher than my hand calculations.
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Fuel Mileage
Good luck with 20. If its a 4x4 or a dually you'll be lucky to get 18. I get 16 to 17 on a regular basis, but that's about it. If you wanna get CLOSE to 20, get a Smarty or H&S tuner, straight turbo back exhaust and that's it. Some people say get a cold air intake too, but I've heard bad things, like lower MPG, unless you're pushing 600+ HP. If you need a how-to for installation, there's carbonitecummins.com for complete instructions. Happy Truckin'
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24 witnessed by others
Stock tires, nothing big, no load in truck, good tune up, H$S black maxx, route Utah border to Denver over I-70. Over and Back. No big accelerations, smooth transitions. two guys with me, 24mpg round trip, no trailer. All Amsoil lubricants. miles on truck approx., 25000. Bigger tires, lift kit, maxx tuner, tool box in the back, two smaller guys, same route mileage ran 18 round trip.
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