It worked very well gaining me 1.5 to 2 additional mpg. I ran one, can't remember the brand, for 3.5 years mounted on the rear of my Leer Shell on an F-150 SCab towing a 22' 5,600# TT. They are not "snake oil", properly set up they will improve your mileage.
After that, you have to look at minimizing the air going under the front of the truck (which is why the Freightliner New Cascadia is only a few inches off the pavement), then keep it from getting sucked under the sides. Minimizing the cab-trailer gap, and cleaning up the air coming off the back of the trailer are probably the two easiest things to do. But then you now have another low-pressure zone behind the wing adding drag. It may even make aero worse, since the air coming off the wing will likely crash into the front of the trailer, rather that going over it. On pickups, the cab-to-trailer gap is generally too large for a wind deflector to realize any benefit. We are taking some longer trips and looking to get better than 8 MPG Seems most trailers already have streamlined nosecaps and the wind deflector on the truck isn't needed. I'm not sure the benefit of a wind deflector. Was MPG improved? If so by how much? Also wind noise tolerable or not? I would like members with REAL WORLD experiences tell me about before and after use. In doing research I have seen many pros and cons to doing this. Looking a purchasing a wind deflector to place on top of my 08 f-350. RV.Net Open Roads Forum: Towing: RV wind deflectors? Open Roads Forum
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