How does the Audi A2 achieve its excellent fuel efficiency?

I've heard that the Audi A2 is one of the most efficient cars on the market. How does it manage to achieve such impressive fuel efficiency while still maintaining high performance?

The Audi A2 uses advanced technology, including a lightweight aluminum frame and efficient engine design, to reduce its overall weight and improve fuel efficiency.

Aerodynamics play a crucial role in the Audi A2's fuel efficiency. The car's sleek design and careful attention to air flow help to reduce drag and improve overall efficiency.