As an automotive aerodynamics expert, I have spent years studying the fluid dynamics that govern how air interacts with vehicles. Aerodynamics is a critical aspect of vehicle design, influencing not only fuel efficiency but also performance and handling. The quest for better aerodynamics is a continuous one, with manufacturers constantly pushing the envelope to achieve the lowest possible drag coefficient, denoted as Cd.

When discussing the best aerodynamics in cars, it's essential to recognize that "best" can be subjective and depends on the context. For instance, a vehicle designed for fuel efficiency may prioritize a low drag coefficient, while a sports car might prioritize downforce for better handling at high speeds, even if it means a higher drag coefficient.

The drag coefficient is a dimensionless number that indicates the resistance of an object moving through a fluid environment. A lower Cd value indicates less air resistance, which is generally desirable for improving fuel efficiency and reducing emissions. However, achieving a low Cd is a complex task that involves careful design of the vehicle's shape, including the front, sides, rear, and even the underbody.

Looking at the list provided, several models stand out for their impressive aerodynamic efficiency. The Audi A6, BMW i8, Mazda3 Sedan, Mercedes-Benz B-Class, and the Nissan GT-R all have a Cd of 0.26, which is quite commendable. These vehicles have been designed with advanced aerodynamic features such as active grille shutters, air curtains, and streamlined body shapes to minimize air resistance.

However, the Peugeot 508 and the Hyundai Sonata Hybrid take it a step further with a Cd of 0.25, indicating a slightly better aerodynamic performance. The Toyota Prius, a well-known hybrid vehicle, also boasts a Cd of 0.25, which is a testament to Toyota's commitment to both aerodynamics and fuel efficiency.

It's worth noting that while a low drag coefficient is important, it's not the only factor to consider when evaluating a car's aerodynamics. Other factors such as lift, which affects the vehicle's stability, and the overall aerodynamic balance, are also crucial. Manufacturers often use wind tunnels and computational fluid dynamics (CFD) simulations to fine-tune these aspects of a vehicle's design.

In conclusion, the best aerodynamics in a car is a balance between a low drag coefficient and other aerodynamic properties that contribute to the vehicle's overall performance and efficiency. While the models mentioned have achieved commendable results, the pursuit of better aerodynamics is an ongoing process with new innovations continually being introduced to the automotive industry.

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Audi A6: 2011-present (Cd 0.26) ... BMW i8: 2014 (Cd 0.26) ... Mazda3 Sedan: 2012-present (Cd 0.26) ... Mercedes-Benz B-Class: 2012-present (Cd 0.26) ... Nissan GT-R, 2011a---present (Cd 0.26) ... Peugeot 508, 2011a---present (Cd 0.25) ... Hyundai Sonata Hybrid, 2013-present (Cd 0.25) ... Toyota Prius, 2010-present (Cd 0.25)More items...read more >>