I have 2014 Crew Cab Laramie, Hemi, 8 speed - INCREDIBLE transmission. The truck isn't even broke in yet (6000 mile) and we ran it across PA on I80 for the weekend. Averaged 79 MPH and 18.9 MPG. I've made shorter slower runs and show 21 MPG. I've had multiple Ram Hemi trucks and this one is the best, smoothest and most comfortable riding I've owned. They just keep getting better each year. I've owned GMC, Ford, Chevy and a Tundra and wouldn't have any other than the Ram. If you are after mileage and aren't really hauling a heavy trailer, the new Pentastar would be the answer. Super high miles and hauling super heavy then maybe time for a diesel.