Truck Wings - Do They Really Save Fuel ?

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Click on the "How Do They Work" link then scroll down to the bottom of the page.  Two photos, without and with, and not much else.  I'm sceptical too without considerably more data to substantiate the claims.
Ah, I missed those two photos Ned, thanks.

I noticed they also reported test results from a truck fleet over a 3 month period, but the data is somewhat anecdotal, which is what you'd expect on a web site intended for advertising the product. Might have been nice to have a link to the full test data, results, analysis, etc.
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