https://www.cnet.com/roadshow/news/2019-mercedes-a-class-sedan-drag-teaser/ > When it goes on sale, the 2019 Mercedes-Benz A-Class Sedan will be the most aerodynamic car available. Not bad for an entry-level model. > Mercedes-Benz put out a teaser for its new A-Class Sedan that focuses on its aerodynamics. The A-Class features a drag coefficient of just 0.22, making it the slipperiest car you can get at a dealership. That's the same drag coefficient as the current CLA-Class , which held the record on its own before the A-Class hit the wind tunnel.