I have had my 2007 Dodge 3500 6.7 for a year and 12000 miles and love it. You need to drive these things like you are borrowing them ie. get on them! Helps to keep them clean, and is a lot of fun. Don't just drive them in town. I pull a 5th wheel rv with great ease and get 14mpg doing it, and 17-20 without it.