Have a 2017 Ram 3500 CTD with 373 gears. Has about 500 miles on it. Will it get better MPG when broken in. Tripmeter says average 15 Mpg. Thanks. PS. IT sure is sweet. All smiles
I've got a 2500 with the 3.42 gears. I average around 18 (hand calculated) with mixed driving, NOT towing. On the highway empty I can get 22 at 70 mph+.
Towing a 9500 lbs travel trailer gets me about 12.5 on average. I'm very please with this truck. Your slightly taller gears will probably give you a little lower mileage... but still very good for a 7700 lbs truck blowing down the highway!