Why is my Kia Ceed's fuel economy worse than advertised?

I recently bought a Kia Ceed and the fuel economy is not living up to the advertised numbers. What could be causing this issue?

Make sure that you are driving efficiently, avoiding sudden accelerations and hard braking. These actions can significantly impact your fuel economy.

Check your tire pressure regularly as underinflated tires can increase fuel consumption.

Consider your driving environment - city driving with frequent stops and starts will result in lower fuel economy compared to highway driving.