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I figure that 0.30 cD mentioned in the carbodydesign article was a GM guesstimate. The article was written in January, but the Lutz comment came just last month.
0.30 is respectable for a 4 door passenger car.
But there's no way they could achieve that with the lower rear end design of the Volt concept. The wheels pushed out to the extreme corners (the rear wheels ARE the corners)? They did the opposite of boattailing there, never mind that the wheels themselves are giant air blenders!
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