How to maximize fuel efficiency in the Kia Soul?

I recently purchased a Kia Soul and I want to make sure I am getting the best gas mileage possible. What steps can I take to improve my fuel efficiency?

Regularly check and replace your air filter. A dirty air filter can decrease gas mileage by up to 10%.

Avoid aggressive driving and maintain a steady speed on highways. Sudden accelerations and braking can decrease fuel efficiency.

Consider using a fuel additive to clean deposits and improve engine performance.