What is the best way to maintain the efficiency of my Audi A2's engine?

I've noticed a decrease in my Audi A2's engine performance and am wondering how I can improve its efficiency. I regularly perform basic maintenance but am unsure of what else I can do.

Regularly changing your engine oil and air filter is crucial for maintaining efficiency in your Audi A2's engine. In addition, keeping your tires properly inflated and using high-quality fuel can also make a difference. Don't forget to schedule routine tune-ups with a trusted mechanic as well.

One simple way to improve your Audi A2's engine efficiency is to avoid unnecessary idling. Turn off your engine when waiting for more than 10 seconds and plan out your trips to minimize stop-and-go driving. These small changes can make a big impact in the long run.

Using a fuel additive, such as a fuel system cleaner, can help increase the efficiency of your Audi A2's engine. However, be sure to carefully research and choose a reputable product to avoid any potential damage to your engine.