How can I optimize the fuel efficiency of my 2003 Audi A2?

I am looking to improve the fuel efficiency of my 2003 Audi A2 and save some money on gas. What are some specific steps I can take to achieve this?

Ensure your tires are properly inflated. Not only does this improve fuel efficiency, but it also helps with handling and safety. Try to check and adjust your tire pressure at least once a month.

Avoid aggressive driving. This includes hard accelerations and sudden braking. Not only does it waste fuel, but it also puts unnecessary stress on your car's engine and brakes. Try to maintain a steady speed and use cruise control when possible.