My previous Ram was a 2018 Sport with 20” Goodyear wranglers, also 3:92 gears. I am surprised at the difference in rolling resistance in my new Rebel with duratracs compared to the goodyears. Letting off the gas on the highway feels like a parachute was deployed. Don’t know if its the compound, grips, weight or size probably all of them but the resulting hit in milage is pretty big, at least 30% worse in my case. I know the increase ride height and lack of a front lower chin in my Rebel have some affect but I feel like the tires are the bigger factor. Not complaining, I expected a hit just surprised that tires would make this much difference.