Introduced in 1955 and still one of the most futuristic car designs ever. The Citroën DS has a drag coefficient (Cd) of 0.36, a figure most saloons struggle to reach even today . There are a few modern cars...including the TOYOTA PRIUS - CD 0.24, FORD FOCUS RS - CD 0.35, INFINITI Q50 - CD 0.26, AUDI A5 - CD 0.25, the range-topping Alfa Giulia Quadrifoglio achieves a decent 0.32 Cd but most are a higher cd.