And to address the question in the title of the thread, I sure wish I had my Hucho book (BEN! Bring it to the GGP in Watkins Glen next month please) there's an entire section about convertible aerodynamics.
Here's a neat tidbit: the drag coefficient of the convertible version (with the top down) of the world's most slippery-shaped production car is 0.14 higher than the coupe it's based on:
Quote:
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The E-class coupe carries what Mercedes claims is the lowest drag coefficient of any production car, ever: 0.24. The convertible slips by at a slightly worse 0.28 with the top up. Drag increases to 0.33 with the top down.
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Source:
2011 Mercedes-Benz E-class / E350 / E550 Cabriolet - Official Photos and Info - Car and Driver