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Regarding Rich's van:
Those are spaced a ways apart, seem to work best on a boxy shape spaced at 3 per foot. I put them on an 88 Accord and went from a consistent 30 mpg to a consistent 32mpg with no other changes. Couldn't get proper spacing on my pickup, but they still significantly reduced the dust signature on gravel roads, plays in the mud too much to get a good mileage average.
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