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I'm with you in concept, DieselHybrid (though I differ on a few details). The Cd thing can indeed be 'spun' to give higher drag vehicles nicer numbers than they deserve--if one is manufacturing cars, the easiest way to get a lower Cd is to make the car bigger. Hucho has a drawing showing how cambering a roof can increase drag, because the frontal area goes up faster than the Cd comes down. Open cockpit racers nearly always have higher Cd than their closed cockpit counterparts, but don't always have less drag (the Bristol 450 is a case in point) because they have more frontal area.
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