What are the key features of the Audi A2 in terms of efficiency?

I am looking for information on the Audi A2's fuel efficiency and its impact on the environment. How eco-friendly is this car compared to others in its class?

The Audi A2 is equipped with a lightweight aluminum body and advanced aerodynamics, making it one of the most fuel-efficient vehicles in its class. It has a combined fuel economy of 37 mpg and emits less carbon dioxide than most cars in its segment.

In addition to its efficient engine and lightweight design, the Audi A2 also comes with regenerative braking technology, which helps to recharge the battery while driving and reduce energy consumption. This feature also improves the car's overall fuel economy.