How to maintain the fuel efficiency of a Kia Soul?

I have been noticing a decrease in the fuel efficiency of my Kia Soul. What steps can I take to maintain its fuel efficiency?

Regularly check and replace air filter to improve engine performance and fuel efficiency.

Keep your tires properly inflated and rotate them every 5,000 miles to ensure even wear and better fuel efficiency.

Avoid aggressive driving and excessive idling to improve fuel efficiency.

Use the recommended grade of motor oil to improve engine performance and fuel efficiency.

Consider using a fuel injector cleaner product to improve fuel efficiency and reduce emissions.