A lower number means the car is more aerodynamic. Other measures exist, but the Cd figure is the one most commonly published by car companies.

Ford's Probe V concept car revolutionized aerodynamics with a drag coefficient of 0.137 Cd – the same as an F-16 Flying ...

How slippery is it? Well, the compact sedan has a drag coefficient of 0.23, which will make it the world's most aerodynamic series production car when it goes on sale in the US this September.

4. Mercedes made a shapeshifting concept car that morphs its body to become more aerodynamic. When the car hits 50 miles per hour, the fins in the front and back of the car extend and change their ...