From what I understand you can use this trick with decent results. This is similar to an arrangement I'm working on with my Jeep. You would probably need more then two or three for a car for it to work well. The big thing is getting them spaced/angled correctly to work optimally.
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Adjusted for my driving habits. 80%city/20%Highway.
20mpg city/30mpg highway or bust! Check out my mods so far
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