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  1. 73m819

    M818 better fuel mileage

    Driving a 915 pulling a lite box trailer, I got right at 6 mpg doing 70 with a bit of work, tried to suck the bottom, after that 65 with work was all I could do.
  2. 73m819

    M818 better fuel mileage

    It was/is heavy duty, the same 855 block with some updates could be had from the factory in the 600 hp range for everyday use on the highway, I have heard of 1000 hp being pulled from the 855 block.
  3. 73m819

    M818 better fuel mileage

    One other thing, about 6 mpg +/- is what you get out of a 855 at higher rpm, it does not matter military or civilian, combined with crap gearing (644 rears and the worse geared transmission in a heavy truck that I have ever driven) equal low mpg, putting "Big" tires on just makes things worse...
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