Why does the Audi A2 have such low aerodynamic drag?

I'm curious about the engineering behind the Audi A2's impressive aerodynamic performance. What components and design features contribute to achieving such low drag coefficients?

The Audi A2 was one of the first production cars to have a full aluminum body, greatly reducing its weight and improving its aerodynamic performance. This lightweight design, combined with the curved underbody and smooth front and rear ends, allows the car to slip through the air with minimal resistance.

The Audi A2 also features an integrated rear spoiler and flush-fitting windows, further reducing drag and improving the car's overall aerodynamic efficiency. This attention to detail in the design and engineering of the car sets it apart from its competitors.

One of the key components contributing to the Audi A2's low drag is its specially designed front grille with adjustable flaps. These flaps open and close automatically to regulate airflow and reduce drag, improving the car's performance and fuel efficiency.