[vaughninms]

bully dog and big tires are killing the mileage.

 

[vaughninms]

PPE makes a good tuner for Duramaxes for mileage boosts. The rims don't make a difference, it's the circumference of the tire that is the killer. The bigger the circumference, the more rolling resistence, hence worse fuel mileage. The engine must work harder to turn those big tires around. Think about it...Take a tricycle tire and roll it, then take a truck tire and roll it. It takes much less force to turn the tricycle tire one revolution than it takes to turn the truck tire one revolution.