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I commute nearly 50 miles a day and see them on quite a few tractor trailer rigs. I think they look better than the wright brothers contraption I've seen on the back of some commercial trailers. They have an interesting website,and my thinking is that every little bit helps...they are a little bit
I believe if thee was really any substantial benefit, all the major trucking firms would have them. I don't see any sign of any aerodynamic contraption on UPS or FedX trucks other than the over cab foil.
Very expensive for what little benefit they provide.
To me they are just another gimmick. If they were such a huge benefit from their claims then you would see millions of OTR truckers with them but you don't.
What is working for the truckers are the air foils for the cabs and under the trailer. I have seen some rigs with the rear foils off the back end but not very many of those on the road either.
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