Why does the Audi A7 use a 48-volt mild hybrid system?

I am interested in the Audi A7 and have seen that it offers a 48-volt mild hybrid system. Can you explain the technical details behind this and how it makes the car more efficient?

The 48-volt mild hybrid system in the Audi A7 helps to reduce fuel consumption and emissions. It does this by allowing the car to coast at speeds between 55 and 160 km/h, with the engine switched off and the power supply for electrical systems provided by the lithium-ion battery. This can save up to 0.7 liters of fuel per 100 kilometers. My advice would be to take advantage of this feature whenever possible to help save on fuel costs.

In the Audi A7, the 48-volt mild hybrid system also provides a boost function when accelerating. This can improve the car's performance and make it feel more responsive. My tip would be to try using the boost function when merging onto highways or passing other vehicles to experience the difference in acceleration.

The 48-volt mild hybrid system in the Audi A7 also enables the start-stop system to turn off the engine earlier and in more situations, further reducing fuel consumption. My suggestion would be to not be alarmed if the engine turns off when at a stop, as this is just the start-stop system working to save fuel.