So far in 34K miles (in less than a year) my 5.7 2015 Ram 2500 4x4 is getting right at 15 MPG to and from work (60 mile round trip) and has had a high of 19 MPG on the highway going 65 MPH with no head wind. Having said that, it gets 7.9 MPG towing the 32' LQ trailer (11K lbs) and around 9 towing my 24' enclosed. Add a head wind and it goes down quite a bit. That equates roughly with my 2001 V10 Ram, though I think the Hemi pulls better. The only thing I really hate about the truck is the drive-by-wire, almost feels like a turbocharged vehicle with the lag time...