What technology does the Audi A1 use for its fuel efficiency?

I am curious about the fuel efficiency of the Audi A1 and what technology the car uses to achieve this. Can anyone shed some light on this for me?

The Audi A1 uses a combination of engine optimization, lightweight materials, and aerodynamic design to reduce fuel consumption and improve efficiency.

The Audi A1 also utilizes a start-stop system that automatically shuts off the engine when the car is stationary, further reducing fuel consumption.

The latest models of the Audi A1 also come equipped with mild hybrid technology, allowing the car to coast with the engine off at certain speeds to save on fuel.