Quote:
Originally Posted by Magajgfha
Sedans with 300 km/h top speed are sold by serious brands and don't employ such aids. Porsche's SUV's do 280 w/out such aids too.
I think it's more of a marketing gimmick, though a working one.
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Many articles about 200+ mph cars discuss the how the carmaker addressed stability and downforce at speed.
Ferrari or Lamborghini (sorry,don't have that in front of me) wrote that rather than add aerodynamic excrescences,they strove to avoid any feature of the cars body which would introduce high-speed instability in the first place.
These stability issues,plus cooling,end up creating shapes whose Cds typically exceed those of the best pickup trucks.
I'd never use a supercar as a template for fuel economy improvements.