CM871 fuel mileage

[superbudy208]

I've tried driving it several different ways, by the foot different speeds cruise no cruise it don't matter at the moment, I just went 1000 miles half loaded and half very light and averaged 5 mpg's and found the truck will not move unless it has 20 psi of boost, I did notice on a long seeping right turn the other night the truck freed way up gained speed and had to let of the pedal, this week I'm going to get the alignment done and see if the chassis is binding up