I won't agree or disagree about the fuel mileage numbers but I know for a fact that putting mine on 65mph cruise control it would SHOW 25+ but when I would calculate mileage and gallons it was about 20mpg and running 75mph to west Texas it would show 22-23mpg but calculate to about 18-19mpg.... this was over several trips and several yrs on a completely stock 5.9 3/4 ton 4x4
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