5.9 or 6.7 Cummins

[weedeater]

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

[sniper3726]

Originally Posted by weedeater

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

EXACTLY. Put the pencil to it and it always changes .

Oh And 5.9 all the way.