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Old 07-30-2017, 05:17 PM   #1 (permalink)
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Clean vs Dirty car aero

I have heard that a dirty car gets better mileage than a clean car because the dirt creates a rough surface, kind of like a golf ball. But Mythbusters tested that and found thhat a dirty car reduces mileage, but then again they sprayed a half inch thick mud coating on it, which is not at all indicative of a "normal" dirty car, unless you go offroading lol. What do you think, and how big could the difference actually be? Thanks

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