Why does the Audi A3 require premium fuel?

I've noticed that the Audi A3 requires premium fuel, but other cars in its class do not. What is the reason for this and are there any alternatives for those on a budget?

Using premium fuel ensures optimal performance and fuel efficiency for your Audi A3. While it may seem like an added expense, it can actually save you money in the long run by preventing engine damage and maximizing your car's power.

The higher octane level in premium fuel allows for a smoother and quieter engine operation, which is important for luxury vehicles like the Audi A3. Plus, it contains additional detergents that help keep your engine clean.