What is the most efficient way to increase fuel economy in an Audi A2?

I recently bought an Audi A2 and I love it. However, I am looking for ways to maximize its fuel economy so I can save some money on gas. What are some specific actions I can take to improve its fuel efficiency?

Regularly check and maintain tire pressure to ensure optimal performance and reduce drag on the car's movement.

Avoid aggressive driving and excessive speeding, as these actions can greatly decrease fuel efficiency.

Consider investing in a high-quality air filter to improve engine performance and therefore increase fuel efficiency.