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I had an adjustable "wing" above the cab on my 1995 Ford F350 with a 460 gasser. It glistened in the sun being polished aluminum ... it diverted a lot of bugs off the front cap ... it lightened my wallet a bit ... it didn't do a thing to gas mileage. These wings made for pickups cannot be compared to what used to be on semis before the cabs came about with the integrated wind spoilers ... they just aren't wide nor tall enough and don't come close to sealing to the top of the cab. Like said ... if they did produce a 3MPG fuel advantage ... you'd see boat loads of them on pickups.
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