Looks can be deceiving, and when you take a glance at the 2014 Mercedes-Benz CLA-Class, it might not seem like it at first, but when tested, it will clearly take the lead by being the world's most aerodynamic production car, period. This fierce looking compact sedan will have a drag coefficient of 0.23, making it the world's most aerodynamic series production car as it hits the US later this September. If you were to compare it with the Toyota Prius, that hybrid has a 0.25 rating, while the 2013 Nissan Leaf electric vehicle has a 0.28 drag coefficient, with the Tesla Model S coming closest at 0.24.
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