How does the Audi A2 manage to have such a high fuel efficiency?

I have heard that the Audi A2 is extremely fuel efficient, using just 5.6 liters per 100 km. How does it achieve this level of fuel efficiency?

The Audi A2 has a lightweight body and aerodynamic design, allowing it to use less energy and thus reduce fuel consumption. Additionally, its engine is finely tuned for maximum efficiency, with a long gear ratio for optimal performance.

The Audi A2 also utilizes regenerative braking, which captures and stores energy that would otherwise be lost during braking. This energy is then used to power the car's electrical systems, reducing the strain on the engine and resulting in lower fuel consumption.

Another factor contributing to the Audi A2's fuel efficiency is its start-stop system, which automatically shuts off the engine when the car is stationary, such as at a red light or in heavy traffic. This reduces unnecessary idling and conserves fuel.