Hey Yall, towed the boat from north ms. to south ms. about 700 ml round trip. 2011 fx4 c/c 6.2.boat is 26.5ft about 8000lb. on the way down got 9 to 10 mpg on the lie o meter, got 9 to 7.5 mpg on the way back up hill . now that is going between 70 to 80 mph,with some pretty good hills. manly used manual shift in between 4th to 6th. only used tow haul to help stop when exiting ramps.. truck did the job well. still gotta get use to the higher rpm,s versa the old deisel.still love the truck, rear locker helped pull boat out of water. now got to clean boat and truck'''