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well, if they were more streamlined with the front, so that there's more air being directed around the Jeep instead of around the foam, you might yield better results. I gained actually about 1-3% out of it, which for me is about 1-3mpg's depending on the weather and wind conditions. Mine are clear plastic though, and I don't know where it came from, I just got it from my shop teacher, who had some extra laying around from our solar boxes.
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