Prime - What speed to get the best fuel mileage

Id think a little bit of that formula would be the fact you're practically running down hill from Wyoming to Nebraska... And winds typically push from the west. Duh, on why you wouldn't do so well turning the truck around.

 

Yeah I should have added that part of the formula.

 

That question is like asking how hot does it get in the summer.

ok, MPGs. Where are you driving; elevation and atmospheric pressure makes a difference. How heavy is the load, weight makes a difference.

are you pulling hills; up is harder than down .

Is it windy?, try running into the wind then run with the wind, you'll see

 

Here are some FUEL SAVING facts from the engineers at CUMMINS https://cumminsengines.com/uploads/docs/cummins_secrets_of_better_fuel_economy.pdf