Why is my Kia ProCeed's fuel efficiency decreasing?

I recently bought a Kia ProCeed and I noticed that its fuel efficiency has been decreasing. I follow the recommended maintenance schedule and I'm using the same driving habits. What could be causing this sudden decrease in fuel efficiency?

Your driving habits could be the culprit. Are you constantly accelerating and braking aggressively? This type of driving can greatly impact your vehicle's fuel efficiency.

Another possible reason could be a dirty air filter. A clogged air filter can restrict airflow and make your engine work harder, leading to reduced fuel efficiency.

Have you checked your tire pressure? Under-inflated tires can increase rolling resistance and decrease your fuel efficiency. Make sure to regularly check and inflate your tires to the recommended pressure.