How does the hybrid engine in the Audi A7 improve fuel efficiency?

I've heard that the Audi A7 uses a hybrid engine, but how does it actually help with fuel efficiency and reducing emissions?

The hybrid engine in the Audi A7 uses a combination of a traditional gasoline engine and an electric motor, allowing it to switch between the two depending on driving conditions. This can significantly improve fuel efficiency and reduce emissions in city driving.

The Audi A7 also has a regenerative braking system, where the electric motor converts kinetic energy from braking into electricity to charge the battery. This helps to further improve fuel efficiency and reduce emissions.

In addition to its hybrid engine, the Audi A7 also has an efficient start-stop system that shuts off the engine when the car is stopped, such as at a red light. This can save fuel and reduce emissions in city driving.