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Hi Jim,
I'm pretty sure that the free space number on the boxfish shape was 0.06 and the 0.095 number applies to the blue model with wheels. There is a later blue model with open wheels (no mention of it's Cd) and the final "real" Bionic car with diesel engine and open wheels (partial rear skirts only) with a Cd of 0.19.
The 0.095 is the lowest number I have ever seen for a wheeled car -- I have confirmed that I am remembering it correctly. Since it already has wheels, that issue is removed... Unfortunately, that is the only image of the model I have ever found, so extrapolating all the key bits is not easy.
And as I said, since the section is basically square-ish, the volume inside is very practical and usable.
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