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Old 01-09-2008, 10:07 PM   #3 (permalink)
Coyote X
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Join Date: Dec 2007
Location: Southen West Virginia
Posts: 654

Metro XFi - '93 Geo Metro XFi Convertible
90 day: 62.17 mpg (US)

DR650SE - '07 Suzuki DR650SE
90 day: 55.26 mpg (US)
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I would think a basic coast down test of some sort would work. Find a flat spot, get the car up to 80mph and let it coast in N measure the time from 75mph to 50mph. Do it enough to get a good average and consistent numbers then remove the spoiler and do the same run again.

Some variation of this would probably be easy for most people to test. I don't think saying always remove it is better though. Remember when I did a coast down test with my rear spoiler a while ago and it was actually better with the spoiler on It was a tiny difference but it was repeatable so it had to actually be helping.

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