Quote:
Originally Posted by DKB_SATX
I'm getting slightly better mpg (hand-calculated around 11 mpg) towing a wider, much-heavier trailer than I was with the '07 5.4L Triton that returned 10 mpg on a good day, and the new truck is 4WD to boot. I generally run between 65 and 70 when I can (yes I know about ST tires and take appropriate action regarding that.) I find I get slightly better mpg in 8th unless it's perfectly flat and/or there's a tailwind.
Old: 2007 F150 Supercrew short box w/ tow pkg, 5.4L Triton V8 and 3.55 limited-slip diff, 2WD, towing 24' Argosy.
New: 2017 F150 Supercrew short box w/ Max Tow, 3.5L Ecoboost and 3.55 e-locker, 4WD towing a 26U Flying Cloud.
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To use as an example:
Should also note that climate and terrain is South Central United States. Pretty well optimum.
Given that travel speed, what was average speed (engine hours versus distance) for a better analysis?
And, per 100-miles, number of steering corrections (include in that "lane changes") as well as use of brakes per 100-miles (excepting entrance and exit from highway). This goes to conditions. Both those encountered and quality of equipment as well as skill in lash-up.
If a slightly lower travel speed decreases those applications and yet results in little to no change in average speed, the "test" is yet to be done as to MPG. (Same for equipment and hitch skills).
As above, what difference from solo at the same speed as loaded over the same or similar route?
What does the TV weigh when towing (less hitch weight)? The only difference on the TV should be hitch weight (to isolate TT weight and aero resistance).
The REAL number is the percentage drop from solo to towing. But factors must be controlled.
The same rig in WV or UT will not see the same (all else identical) due to climate and terrain.
Find AVERAGE speed. Find % change.
Now it's real. Not otherwise.
To the OPs Q: 10 trumps six. But will it be quantified in a lower fuel bill? You've thus far no answers to that part of the question.
The difference on my wholly different rig was the models prediction of 40%. But it had to be tested to confirm. This is how to make comparisons across colder and warmer regions plus mountainous versus plains. Etc.
And, if it's 40%, with these trailers it can be bettered. Driver skill enhancement. In the truck industry, all else the same, the better drivers are as much as 30% better than the worst.
Always room for improvement.
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