Forum Discussion
Flapper
Sep 08, 2021Explorer
Just for a data point or two:
2012 F-150 Eco, with HDPP. 2160 payload.
With the old Jayco fifth wheel (~8,500 lbs), I got 10.5 mpg over 15,000 miles.
With the current Grand Design 2670MK tow behind (same weight), I get 8.5 mpg over 12,000 miles.
The fifth was much higher above the truck. With the trailer I'm guessing I'm getting a lot of swirl as the air comes over the cab, hits the cover over the bed, and then goes up the front of the trailer - hence lots more drag, despite the lower height. Maybe a topper would help, but I have no need for one other than that, so I live with it.
Out west mountain towing with the fifth was great - I could pass any lumbering truck I wanted to. No issues with really long 6-7% downhills for engine braking. Haven't challenged the trailer out west, but in the Appalachians, there have been no issues.
BTW, with the 3.73 gearing, empty, I get 17.5 city, and 20-21 highway.
Your new one will be better.
(When we had the fifth totaled due to a roof tear/delamination, we found all newer fifths had gained weight, putting me over payload. Hence the TT. Jealous - the 2560# would've gotten me back into a fifth)
2012 F-150 Eco, with HDPP. 2160 payload.
With the old Jayco fifth wheel (~8,500 lbs), I got 10.5 mpg over 15,000 miles.
With the current Grand Design 2670MK tow behind (same weight), I get 8.5 mpg over 12,000 miles.
The fifth was much higher above the truck. With the trailer I'm guessing I'm getting a lot of swirl as the air comes over the cab, hits the cover over the bed, and then goes up the front of the trailer - hence lots more drag, despite the lower height. Maybe a topper would help, but I have no need for one other than that, so I live with it.
Out west mountain towing with the fifth was great - I could pass any lumbering truck I wanted to. No issues with really long 6-7% downhills for engine braking. Haven't challenged the trailer out west, but in the Appalachians, there have been no issues.
BTW, with the 3.73 gearing, empty, I get 17.5 city, and 20-21 highway.
Your new one will be better.
(When we had the fifth totaled due to a roof tear/delamination, we found all newer fifths had gained weight, putting me over payload. Hence the TT. Jealous - the 2560# would've gotten me back into a fifth)
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