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Jim,
I truly think that 0.1 is the lower limit for a street going car; no matter how many seats it might have. Even the 0.095 car had no cooling or circulation intakes. The best Aptera did was 0.11.
I just don't think you can take a Cd 0.04-0.06 "ideal shape" and put wheels on it, and put the wheels on the ground, and do it without hitting 0.1 or so. It just can't be physically done.
The fact that the 0.095 car has wheels and is that low Cd is amazing enough. The wheel skirts are unrealistically low clearance -- change that just a smidge, and you're up over 0.1.
I think it is pretty cool that nature and evolution has fine tuned things so well. Also, check out the structural "innovation" of the boxfish; with it's hex structure within the skin.
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