6.6 Ram

The 8speed is the same regardless of SRW or DRW. MPG difference will be 2-4 mpg less than a diesel, .5-1 mpg less SRW vs DRW. We have a 2015 3500 SRW and get 12-14 empty and 8-10 with camper and we don’t baby the truck. Average last 2, 5000 mile trips with camper was 9.4mpg. If all you do is haul a camper and occasionally tow something, there is no way you can make a diesel pencil itself out money wise. We have been looking for a dually and have found several with the diesel we like, but at the end of the day we don’t want the additional costs associated with the diesel, no matter how cool they are or how effortlessly they haul/tow. As has been stated, if you already own a diesel and it hasn’t got a 100000 miles on it, and is giving you no troubles keep it. On the other hand, if you just want to get a new truck, I wouldn’t hesitate to buy a 6.4 Ram or a new 7.3 powered Ford. Good Luck.