I have a 2007 Dodge 2500 CTD 4X4 automatic with a decent lift. Running 315/70R17 Nittos, daily driver with tuning package that I rarely if ever use. I get 15.5 mpg city, 19-20 highway, and when towing my small toy hauler this past thanksgiving I got 8.9-9.5 mpg towing. Keep in mind I went up two...