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I got 12.3mpg with a 2012 Ford F350 SRW pulling a sOB 40 ft 16200 GVW 5th wheel. That was the average for going from California to Connecticut. I set the cruise control to 60mph and enjoy the scenery. I suspect the new Fords get less mph because they increased the torque and hp. That possibly true for the newer Cummings as well. HP and torque require fuel to achieve that power if required. Also, friction increases by square of the speed, so driving faster and head winds see an exponential increase in friction.
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