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Neil,
Audi thing shown does not follow what I call Morelli rules as far as the elliptical cross section requirement. Thus, air moving toward the low pressure region under the vehicle will traverse a most un-aerodynamic ridge, and again when it flows upward toward the rear the same issue comes about.
However, the Avatar pretty much meets my definition of struts holding the body apart from the wheels. Somehow it looks more like a fashion design effort pretending to be aerodynamic, but maybe not.
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