womps wrote:
My lease was up on my 2015 F150. We just purchased a 38 foot 5th wheel so needed an F350. Purchased a 2016 crewcab, short box, powerstroke, 3.55 axle ratio, 18 inch wheels Lariat model 4x4. Towed with it first time on Saturday. It only had 600 miles on it but I was dissapointed in the fuel economy. With a 98 litre tank 250 miles will be tops. The exhaust brake does no more than shift down the tranny. I can not tell any difference if I shift down manually without the exhaust brake on or put the exhaust brake on and let the computer do its thing. Our 5th wheel weighs 10,600 lbs empty with a tounge weight of 2,300 lbs. Truck squats less about an inch with 5th wheel hooked up. We pulled 120 miles, no wind and mostly flat except one short hill on the freway. Not sure of the grade. Cruise will loose about 5 kmph going up a hill and gain same going down. Again, the biggest dissapointment is the combination fuel economy and small tank. Computer said 26.1 litres to 100 k.m. Not sure yet how accurate it is. I know it is new but I don't expect much of an improvement with miles.
Well, your equipment is still pretty darn new. The transmission and engine programming are still adapting to your driving style, along with the mechanical components still running-in together. Give it about 5,000 miles or so and you'll see a difference. The harder you drive it, the sooner all the components wear into each other and ultimately reduce friction.