Supercharged 5.7 w stock 4.30 rear gears premium fuel. I get 10 - 11 mpg all day towing our RV @ 55 - 60 mph Any more than that and the fuel milage will go down as the speed goes up. The front of the RV is the milage hog at 13' tall and 8' wide there is allot of resistance there. A pretty good head wind will also drop the milage as a good tail wind will help it, same with the mountains. Without pulling the RV I can get a solid 19 mpg @ 65 mph.
2014 8289WS Diamond pkg
2014 Ram 2500 SB DC TCD