How do I improve my Kia Ceed's fuel efficiency?

I've noticed that my Kia Ceed's fuel efficiency has been decreasing lately. Is there anything I can do to improve it?

Regularly check and replace your air filter to improve air flow and increase fuel efficiency.

Make sure your tires are properly inflated. Under-inflated tires can decrease fuel efficiency.

Avoid idling for long periods of time and plan your trips efficiently to reduce unnecessary driving.

Consider using a fuel additive to clean the fuel system and improve fuel efficiency.

Get your car serviced regularly to ensure all components are working properly and not causing decreased fuel efficiency.