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theorietically couldnt u get better mpg if your car was clean and waxed? much like a waxed surfboard on water glides better, waxed car in wind "slips" better. (yes i realize water is obviously much more dense than air but still)
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It will affect your mpg less than 1/4 or so. It's so insignificant that plain old A-B-A testing usually won't detect a statistically significant difference attributable to this.
There are exceptions, such as your car being covered in years worth of road grime and mud. Then the difference could be pretty sizable.