How does the Audi A3 engine achieve maximum efficiency?

I've heard that Audi A3 has an efficiency mode, but how exactly does it work? What mechanisms or technologies are used to increase the car's fuel efficiency? Can it be applied to other car models as well?

The Audi A3 engine is equipped with a turbocharged direct injection system which helps to increase fuel efficiency. The system uses a precise fuel injection process to ensure optimal engine performance and reduced fuel consumption, making it a great option for fuel-conscious drivers. This technology can also be found in other Audi models such as the A4 and A6.