Why does the Audi A8 have a twin-turbocharged V6 engine?

I've noticed that some luxury sedans, like the Audi A8, have opted for a twin-turbocharged V6 engine over a larger V8. Why is that? Does it affect performance or fuel efficiency?

The decision to use a twin-turbocharged V6 engine in the Audi A8 was primarily driven by fuel efficiency and emissions standards. By using a smaller engine with forced induction, Audi is able to achieve similar performance as a larger V8 while also meeting stricter regulations.

Another reason for the twin-turbo V6 is weight savings. By using a smaller engine, the Audi A8 is able to shed some excess weight and improve its handling and agility on the road.