Found an article with the EPA blanket percentiles they used to simulate aero effects:
EPA Mileage
Yeah... no wonder the numbers are bunk.
Quote:
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According to the official EPA website, their new “in use” stats will “not affect the CAFE calculation for purposes of determining manufacturers’ compliance with the CAFE standard.” In other words, the new CAFE averages will continue to be based on the old EPA tests. Well how about that?
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EDIT:
Here is another set of articles on EPA numbers and how.... "real" they are, or aren't.
I couldn't find the EPA test results they conduct or receive on cars which goes into their calculations. Hopefully someone can find and post a link to them.