How to maximize fuel efficiency in a Kia Ceed?

I am looking for ways to improve the fuel efficiency of my Kia Ceed without spending a lot of money. Any tips or suggestions?

Regularly change your air filter to improve your car's fuel efficiency. You can easily do this yourself or have a mechanic do it for you.

Make sure your tires are properly inflated and aligned. This can greatly improve your car's fuel efficiency and also extend the life of your tires.

Avoid aggressive driving habits like rapid acceleration and hard braking. This can significantly decrease your fuel efficiency.