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Of course it would create drag and wind friction but you won't feel the difference or mph or mpg unless you are at extremely high speeds...I remember reading about a Supra turbo and they test that exact theory...they experimented by doing top speed passes on a flat surface road...think the salt flats...anways they did a regular pass and then they turned the side mirrors into the body and taped up any little lines infront of the car...such as headlight line, hood lines and whatever they could think would cause drag....they got like 5mph more at high speeds....
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