GAS MPG

[Beastmaster]

Originally posted by RubHer Yellow Ducky:
What we are looking for is if anyone else except MFW is AVERAGING (city/hwy) 20+ MPG.

You'll never get that.

Unless you drive nothing but Highway at a continuous, 100 percent duty cycle of the truck (meaning, you fill the truck while you're driving down the road) AND at a constant speed that is never unwavering AND you are in an ideal road condition of perfectly flat with no additional wind drag, you will never achieve anywhere close to 20mpg.

Being realistic, if you achieve about 17-18mpg mixed mode (city/hwy), you're doing really, really great. The vehicle is only rated for 20MPG highway anyways, 16MPG city.

You will likely achieve the best gas mileage when you run it (probably) around 3500/4000 rpm. That's above the RPM for max torque, and it's approaching the highest point of the horsepower curve, which is at 5600 rpm. Somewhere in between 2800 rpm (max torque) and 5600 rpm (max horsepower) will be your magic number (in RPM) that will give you the most efficiency.