2015 F350 DW Questions

Probably not much help but.... Our 04 Duramax 3500 3.73 long bed DRW 4x4 with camper loaded weighs in at 12,000 +- 100# averages 15 most of the time and that's whatever the speed limit is. Major side wind or head wind reduces our speed and mileage to 13-14. Those are town and highway mpg. We've not hauled a trailer with this yet but expect a drop even further. Will see when new car trailer arrives and we tow the FJ Cruiser a while. Don't figure the tandem axel one horse trailer will make as much difference since it tucks in behind everything and weight is much less. Horse fat but not THAT heavy! Seems like the newer diesels aren't competing well with our Oldie but goodie. I had an 09 3/4 ton same as the dually that got 23 regular empty and 18 pulling 3 horse slant with 10'short wall. People that got that set up got a bargain! If we were to buy another truck I think we'd try a Dodge if not a Chevy, but that's just us. Our kids have 3 Dodges, 1 each, and are passed with them. One was a dyed in the wool Ford person and had said they not go back. Two are gas, one is diesel. They are all new models 2014 and 2015.