How does the Audi A1's engine contribute to its impressive fuel efficiency?

I am considering buying an Audi A1 and have heard great things about its fuel efficiency. I would like to know more about the specific engine features that contribute to this and how they compare to other models in the same class.

The Audi A1's fuel efficiency can mainly be attributed to its TFSI engine technology, which combines turbocharging and direct injection for optimal performance and reduced fuel consumption. In comparison to other models, the A1's engine is also designed with lightweight materials and aerodynamic elements to further enhance efficiency.

As a current Audi A1 owner, I can attest to the impressive fuel efficiency of the car. One key factor is the start-stop system, which automatically switches off the engine when the car is stationary, reducing unnecessary fuel consumption.