Compression Ignition Addict
Join Date: Mar 2011
Location: Great Falls, VA
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I notice the same thing when i run gearhead tunes. I have the older IDP tunes and i can get 15.5-16 highway running IDP's Extreme Mild tune on my 37's. Same driving with my gearhead tunes, i'm geting about 13.5.
The IDP Extreme Street tunes gets me the best mileage.. but i'm not really looking for "good" mileage... not gonna happen with my truck. 6.4 + lift + 37's = Garbage mileage no matter what.
2008 Ford F250 6.4L Crew Cab Short Bed King Ranch
3.5" ReadyLift Leveling Kit, 37x13.5x20 Toyo MT's on stock 20's, Dual Steering Stabilizer, Livewire w/ IDP, KEM, Gearhead, S&B, 5" Flo-Pro, Rudy's EGR Delete and Cold Side Pipe, CCV
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