Fuel mileage on Dodge 5.9 Cummins while towing

Thanks for the serious responses. For those that feel the need for a sarcastic response because I ask a simple question, why bother posting? Mileage is not a game changer either way, but it is a factor in our decision. We are weighing the pros and cons of each.

We have been looking at later model fivers and honestly have been unimpressed with the build quality, so started toying with the idea of a DP in the same price range. Thanks again for the SERIOUS replies.