Why is the fuel consumption in the Audi A2 significantly lower than in other comparable cars?

I have noticed that the Audi A2 has a particularly low fuel consumption. Can you explain the technology behind this and how it compares to other similar models?

The Audi A2 uses innovative lightweight construction methods and aerodynamic design to reduce its weight and drag. This results in a more efficient use of fuel and ultimately leads to lower fuel consumption. However, this also means it may be more expensive to repair in case of damage.

The Audi A2 is equipped with a start-stop system which automatically switches off the engine when the car is stationary. This significantly reduces fuel consumption in city driving. It also reduces emissions and helps with environmental conservation.

The Audi A2 also has a regenerative braking system, which uses the kinetic energy from braking to recharge the battery. This technology further contributes to the car's overall fuel efficiency.