I was hoping that the Model S would have "top-notch aerodynamics" (cited from ) but then there is this rumored number of Cd=.28. The upcoming Mercedes B(!) class has .26, the E class coupé has .24 (reportedly the best Cd of any mass production passenger car). That does not make the Model S' .28 stand out, at least not in a positive way. The difference between .28 and .24 is huge. Does anyone have the source where the .28 comes from? Or are there any other, newer, better numbers?
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