How efficient is the Audi A6's automatic start-stop function?

I've heard that the Audi A6 comes with an automatic start-stop function, but I'm not sure how it works and how efficient it is. Can someone explain it to me?

The Audi A6's automatic start-stop function is indeed a great feature. It automatically shuts off the engine when the car comes to a stop and restarts it when you take your foot off the brake. This not only saves on fuel consumption, but also reduces emissions.

I've had the Audi A6 for a year now and the start-stop function has never failed me. It is extremely efficient and has not caused any issues with the engine. I highly recommend activating it for better fuel economy.

As someone who drives a lot in city traffic, the start-stop function is a lifesaver. It has significantly reduced my fuel expenses and has made my drive smoother and more eco-friendly.