How does the Audi A2's FSI engine improve fuel efficiency?

I'm curious about how the Audi A2's FSI engine works and how it is able to improve fuel efficiency compared to traditional engines. Can anyone explain this in simple terms?

The FSI (Fuel Stratified Injection) technology in the Audi A2 works by injecting fuel directly into the combustion chamber instead of the intake manifold. This allows for more precise fuel delivery, resulting in better fuel efficiency.

With FSI, the fuel is injected at a higher pressure and at precisely the right moment for optimal combustion, leading to better fuel efficiency and lower emissions.

Another advantage of FSI is that it allows for a higher compression ratio, which can further improve fuel efficiency. This also results in a more powerful and responsive engine.