How does the Audi A2 achieve optimal fuel efficiency?

I am looking for a car with great fuel economy and was wondering how the Audi A2 achieves it. Can someone shed light on this?

The Audi A2 achieves optimal fuel efficiency through its lightweight design, aerodynamic shape, and advanced engine technology.

The key to the Audi A2's fuel efficiency lies in its efficient four-cylinder engines, which use turbocharging and direct injection technology to reduce fuel consumption without compromising on performance.

One of the main factors contributing to the Audi A2's fuel efficiency is its use of lightweight materials, such as aluminium, in its construction. This reduces the overall weight of the car and allows it to be more fuel efficient.