What is the best way to maintain fuel efficiency in an Audi A1?

I recently purchased an Audi A1 and I want to make sure to maintain good fuel efficiency. Any suggestions on how to achieve this?

Regularly check and change your car's air filter according to the manufacturer's recommendation. This will ensure optimal air flow and help maintain fuel efficiency.

Avoid aggressive driving habits such as frequent accelerations and sudden braking, as they can significantly decrease fuel efficiency in the long run.

Regularly maintain your tire pressure at the recommended level to ensure optimal fuel consumption. Under-inflated tires can decrease fuel efficiency by up to 25%.