The result was variable, Chrysler corp (after 1956) had the most effective ones. 1946 Cadillac and 1959 Chevrolet not so much.
much goodness: Just A Car Guy: aerodynamics
The 2nd entry, from Oct 2018, has an Ecomodder video.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Necessity is the mother of invention, but simplicity is it's favorite aunt --Amish proverb
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