How does the Audi A2 reduce drag and optimize efficiency?

I am interested in learning more about the aerodynamics of the Audi A2 and how it contributes to its overall efficiency. Can someone provide more information on the design choices and technology used to reduce drag and improve performance?

The Audi A2's shape incorporates several aerodynamic features, such as a smooth underbody and a tapered rear end, to reduce drag and improve efficiency.

Audi uses virtual aerodynamic simulations during the design process to optimize the A2's aerodynamics, resulting in an impressive drag coefficient of 0.25.