Why do I need to use 91 octane fuel in my Audi A8?

I've heard that premium fuel is recommended for high performance cars like the Audi A8, but is it really necessary? What happens if I use regular fuel instead?

Using lower octane fuel than what is recommended for your Audi A8 can cause engine knocking, which can damage your engine over time.

Premium fuel has a higher octane rating, which means it can withstand higher compression in the engine. This is important for high performance cars like the Audi A8.

While it may be more expensive, using premium fuel will actually save you money in the long run by preventing costly engine repairs.