How to improve Kia ProCeed's fuel efficiency?

I'm a Kia ProCeed owner and I want to improve my car's fuel efficiency. What are some ways I can achieve this?

Regularly maintaining your car by replacing air filters, keeping tires properly inflated, and changing oil and spark plugs can greatly improve fuel efficiency.

Modify your driving habits, such as avoiding sudden accelerations and maintaining a steady speed, can also help improve fuel efficiency.

Consider investing in a fuel efficiency device, such as a fuel injector cleaner or a fuel efficiency chip.