My 2012 I had "averaged" 12.5-13 with 3:73's. The new ones "2017" are supposed to do better now that they have a trans specifically for the gas 6.2 and tuned for it. Plus they are awesome looking trucks! If you are serious about it, Id order one with the 4:30 rear end though. Everything I read says this is a better ratio for the 6.2 and really brings out its full potential. Only thing that suffers is highway mileage which only drops 1-2 mpg, but daily round town mileage actually improves some as the truck isn't lugging as much. Again, only what I've read though. Let us know what you decide! I love new trucks! Lol