Why is my Kia ProCeed experiencing decreased fuel efficiency?

I have noticed that my Kia ProCeed's fuel efficiency has been declining over the past few weeks. What could be causing this and what steps can I take to improve it?

It is possible that your Kia ProCeed's air filter is dirty or clogged, causing it to work harder and use more fuel. You should have it checked and replaced if necessary.

Another potential reason for decreased fuel efficiency could be low tire pressure. Make sure to regularly check your tire pressure and inflate them to the recommended level.

If your Kia ProCeed has a faulty oxygen sensor, it could be causing it to use more fuel than necessary. Have a mechanic check the sensor and replace it if needed.