Why does the Audi A2 have such high fuel efficiency?

I've noticed that the Audi A2 gets significantly better gas mileage than other vehicles in its class. Can someone explain why this is?

The Audi A2 is designed with a lightweight and aerodynamic body, which helps to reduce drag and increase fuel efficiency. In addition, it also utilizes advanced engine technologies such as direct injection and start-stop systems to further improve efficiency.

Audi has a long history of prioritizing efficiency in their vehicle designs. The A2 is no exception, with features such as regenerative braking and a hybrid engine in certain models. Combined with its lightweight construction, this leads to exceptional fuel efficiency.