How to improve the fuel efficiency on my Kia Soul?

I have noticed that my Kia Soul's fuel efficiency is not as good as it used to be. What can I do to improve it?

Regularly check and replace the air filter. A clogged air filter can decrease fuel efficiency.

Keep your tires properly inflated. Under-inflated tires can decrease fuel efficiency.

Avoid excessive idling. Turn off the engine if you're going to be parked for more than 30 seconds.

Try using cruise control on the highway. It can help maintain a consistent speed and improve fuel efficiency.