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Old 11-17-2018, 06:37 AM   #31
flybouy
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Quote:
Originally Posted by fourfourto View Post
Mine was $100 bucks, at least 10 percent increase in gas and I do feel a difference lugging up long hills.
My tow vehicle only has a 5 cyl I need all the help I can get.
I'm happy for you. My BIL had a H3 and after a year of pulling their little teardrop trailer and traded it in for a f150. They towed it with several suvs before that and spent a lot of money until landing on the f150. As for your mpg gains if your H3 is anything like theirs that would be <1.5 mpg gain. Too many factors IMHO to affect mileage claims like that. Change in traffic, change in wind speed or direction, weights, temps, road surface, to say nothing for driver consistency. I'm only stating the reasons I wouldn't buy it. Your satisfaction for your purchase obviously works for you.
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Old 11-17-2018, 02:26 PM   #32
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I had this deflector(picture attached). It was made by Wingmaster and I think it was an Aerotravel III. I was pulling 14K pounds with a gas 454 and 4.56 gears and became a friend of all gas station attendants while owning that rig. The deflector did nothing to improve mileage in my case but that wasnt what I was thinking when I purchased it. That rig had a terrible chucking problem on those concrete highways with expansion joints at highway speeds. The best analogy I can make is think of an inch worm. The truck hits the expansion joint(drag), the trailer catches up(takes up play in the kingpin/hitch) and bump. Next, the trailer hits the same joint(drag) and since the truck is pulling normally again, the trailer pulls back(takes up play the other way) and bump.

My though process was what if you could reduce drag at the trailer and add drag to the truck at highway speeds and the deflector idea came to mind. For my specific situation it worked and improved things considerably. Now, having a truck with enough power, a hitch/kingpin with very little if any play, and a more aerodynamic front cap on the RV, the deflector has been unnecessary. Of course, reducing bug hits would be well worth it but the company went out of business and it is no long possible to get the mounts.
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Old 11-17-2018, 02:55 PM   #33
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These wings work but play h**l with gas mileage.
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Old 11-17-2018, 08:10 PM   #34
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Most of the trailers don't need help in the front, but the square rear is where the help is needed.
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Old 11-18-2018, 05:01 AM   #35
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Most of the trailers don't need help in the front, but the square rear is where the help is needed.
I think that's why we are seeing more 18 wheelers with this on the back end.
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Old 11-18-2018, 08:01 AM   #36
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Ford (and I'm sure other manufacturers as well) have done an excellent job of "smoothing the airflow" on today's vehicles. They have gone so far as to redesign the windshield wipers and their location, park position and function. Hoods, windshields, rooftops, truck beds, tailgates, tailgate "dams" have all been designed with airflow function as a primary concern. Even small, seemingly insignificant things like the curve of the rear of the cab have been designed to not disrupt airflow.

Hanging a 5' wide "wing" on top of today's trucks is significantly disruptive to the airflow over the vehicle. When engineers change the slope of the windshield 1 degree and reposition the wipers 1/4" up or down, to "fine tune" the airflow, I find it hard to believe that much "square bulk" hung to the roof can be beneficial or an improvement. For me, it seems more "snake-oil" than engineered science... YMMV
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