[aerohead]

WIKIPEDIA credits the CLA Coupe (C117) CLA 180 CDI ( 107-hp ) Euro-spec Blue Efficiency with Cd 0.22:
* A-pillars
* Exterior mirror housings and rear shape
* Diffuser
* Underbody
* Radiator shutters
* Wheel trim
* Serrated wheel deflectors ( all for wheels )
* 205mm section tires
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The Cd 0.30 is from Don Sherman @ A2 Wind Tunnel, and has been called into question by some ( the Toyota Prius also tested, recorded a higher Cd than what Toyota measured, same for the Honda Insight and Nissan LEAF ) Only the Tesla S registered a Cd equal to it's published value [ then some report that Tesla's value was actually Cd 0.26! ].
The CLA 180 Euro-spec BE car isn't available in the USA. They must have tested something other than the Cd 0.22 variant.
A real can of worms!