We have a 2018 F350 Platinum with the 6.7 diesel. We live in Colorado at altitude, but it is amazing the towing availing of this truck. We had prior a 27’ pull behind with a F150 V8. The drive time was always a little tense worrying about RPM and working the engine to hard. Now, we set the cruise at 72MPH and steer her to the next destination. I agree that she is a gas hog- we spent around $900 for fuel hauling our 36’ FW from Denver to Tucson and back. But I gotta say, it was the most relaxing drive and I did not mind making it.
Good luck