lower cost
A generation back, three flavors of the Mitsubishi Mirage 5-door had Cd 0.27. Mitsubishi took advantage of the greenhouse length, lost on many other vehicles of higher drag.
It's an A segment minicar, but it's shape would scale all the way up.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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