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[Camstyn]

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.