6500 miles since April purchase. At least half if not more of those miles hauling an off road trailer all over Colorado. Use more DEF than expected but an easy and cheap(Walmart) fix. I absolutely love this engine and the Rubicon package we got. Upgraded from a 2016 2door Rubicon and it's like night and day on power, mileage and overall comfort. Knock on wood, but I just can't imagine a better package. Didn't do it to save money, did it for the performance. Still get around 25 mpg combined, and around 21 hauling our trailer. Happy camper.