I had a 2010 Dodge 2500 4x4 QC Hemi with the 3.73 gears. For one, and this may have changed, but the tow rating was only 8800 lbs. The payload was good at about 2400 lbs. As for MPGs, empty just driving I was lucky to see more than 12 city, maybe 15 hwy. Towing was about 9.5 MPGs. And I drive with a light foot. SO gas mileage is pretty crappy. After all, the 2500 weighs like 6400 lbs empty and is shaped like a brick. I don't know what has happened with the tow ratings in the newer 2500s with the six speed auto, but Dodge gassers with the Hemi were the lowest rated 3/4 tons around ...like I said, 8800 lbs. Reality was less because once you load up the truck with family and junk, your tow rating is more like 8000. Anyway, just be aware that, at least in 2010 with the VVT Hemi, the truck didn't get good gas mileage at all, empty or towing.