What is the most cost-effective way to maintain my Audi's performance?

I've recently purchased an Audi and I want to ensure it stays in top condition. However, I also want to avoid overspending on maintenance costs. What are some cost-effective ways to maintain my Audi's performance?

Regularly check and replace your engine's air filter. A dirty air filter can restrict airflow and decrease fuel efficiency. You can easily clean or replace it yourself, saving you money on potential engine damage and improving overall performance.

Stay on top of your tire pressure. Under-inflated tires can decrease fuel efficiency and even cause uneven wear, leading to costly replacements. Use a tire pressure gauge and check them regularly, especially before any long trips.