Which term describes the aerodynamic efficiency of the exterior designed to enhance performance?

The term that best describes the aerodynamic efficiency of a vehicle's exterior designed to enhance performance is low drag coefficient. A low drag coefficient indicates that the vehicle's shape allows it to move through the air with minimal resistance, which is essential for optimizing speed and fuel efficiency. This design feature reduces the amount of energy needed to overcome air resistance, particularly at higher speeds.

In high-performance vehicles, achieving a low drag coefficient is a critical aspect of the design process, as it directly impacts acceleration, handling, and overall performance. Vehicles with a well-designed aerodynamic profile tend to have better stability and control, especially at speed, making a low drag coefficient a desirable trait in performance-oriented cars.