Why is the 2021 Audi A5 engine more efficient than previous years?

I'm considering purchasing a 2021 Audi A5, but I'm wondering why the engine is advertised as being more efficient than previous years. Can someone explain the specific changes and improvements that have been made?

The 2021 Audi A5 comes equipped with a new, more powerful engine that has improved fuel efficiency due to its advanced turbocharging technology. This allows for a smoother and more responsive driving experience while also reducing emissions.

One of the main changes made to the 2021 Audi A5 engine is the implementation of a mild hybrid system, which allows for energy recapture and better fuel management. This, along with improved aerodynamics, contributes to its increased efficiency.

The 2021 Audi A5 also features an updated transmission system that optimizes gear shifting for improved fuel economy. Additionally, the engine has been tuned for better efficiency at lower speeds and during stop-and-go driving.