What is the best way to maintain the Kia Stonic's fuel efficiency?

I recently purchased a Kia Stonic and I want to make sure I am doing everything I can to maintain its fuel efficiency. What steps should I take to keep my fuel costs low?

Regularly check tire pressure and keep them properly inflated. This can greatly improve your fuel efficiency.

Avoid accelerating too quickly and braking hard, as this can use up more fuel than necessary.

Make sure to regularly change your air filter, as a dirty one can decrease your fuel efficiency.