I've no dog in this fight, but I watched 2Five7's Youtube video and I was kind of taken back at seeing that tach at 5,000 rpm and nudging over to maintain 60 mph and that ten speed transmission staying in fourth gear the whole way. High rpm to make any kind of usable power is why I sold off my old 5.0 F150 to get a larger v-8 with better low end torque. I realize that was a heck of a test load, but 2.2 mpg would sure be an assault on my wallet.
That motor is designed to rec like that, it will do it all day with no problems. 16k up an 8% grade what kind of mpg did you expect?
That's only an 8 mile pull or something like that.
My dad has a similar 5th wheel setup to mine, (his weighs about 1000 lbs more) and when we pull our 5th wheels plus our side by sides behind them, he gets 1.5-2.0 mpg better than I do in his 6.7 powerstroke. Yes, he can go fast than I can, but should we really be exceeding the speed limit on mountain roads??
