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In my aviation classes we learned that a layer of frost the thickness of sandpaper on your wings will increase drag 40%, a fairly significant amount. Of course that would be a heck of a lot of dirt to get a layer that thick. Not to mention that drag increases exponentially with velocity, and the planes we fly cruise at around 120mph.
So I would venture to say that it would help, but not even enough to pay for the washing and waxing. My car is pretty dirty right now, maybe I'll test it out.
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