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I just drove mine from Virginia Beach VA to Sumas WA (~3100 miles), drove with the cruise control, didn't speed. Lots of it was 75mph, other times 65 or even 55mph. Truck has the performance tune loaded from the Superchips Flashpaq. I averaged about 12.5mpg for the total trip. 12mpg was pretty consistent while running at 75mph and 13-14 at 65 or slower.
To be quite honest, these numbers are not impressive to me at all after owning a 20+mpg (25mpg a couple times, honestly) duramax, but I'm surprised that I'm not doing any worse than the stock trucks seem to be doing, with this big lift and tires.
Here's what I would like to know. Why does my 7,000lb empty pickup truck not get much better fuel mileage than my 40,000lb empty 625hp 8-axle 30 tire square-box style completely unaerodynamic Peterbilt pulling two empty flat deck trailers?
I honestly wonder if the manufacturers are not purposely designing these trucks to be much harder on fuel than they could be. Fuel companies getting their fingers involved or what, I don't know, but things just don't seem to add up.
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2008 F350 crew cab SRW LB 4x4 King Ranch, 40s on 22s, 10" Fabtech lift, big fat and slow
2005 F150 reg cab LB 4x4 XLT, 5.4 auto, 33s on 17s, 2" lift, FOR SALE
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