How to improve the fuel efficiency of a Kia ProCeed?

I have been using my Kia ProCeed for a few years now and I've noticed that the fuel efficiency has decreased. I want to find ways to improve it. What should I do?

Regularly maintain your car and make sure all parts are in good condition. This includes changing the air filter, spark plugs, and oil on a regular basis.

Avoid aggressive driving and speeding. This can significantly decrease fuel efficiency.

Consider using a fuel additive to improve fuel efficiency. Just make sure to do thorough research and choose a reputable brand.

Check your tire pressure regularly. Under-inflated tires can decrease fuel efficiency.