Why is the Kia Ceed's fuel efficiency much lower than advertised?

I recently bought a Kia Ceed and noticed that the fuel efficiency is not at all close to what was advertised. It's using way more fuel than I expected. Any idea why this could be happening?

It's possible that the fuel efficiency ratings were measured under ideal conditions, such as on a test track with no wind or traffic. Real-world driving conditions can be very different and can greatly affect fuel efficiency. It's always a good idea to read reviews from other owners to get a better idea of real-world fuel efficiency.

Another factor that can affect fuel efficiency is driving habits. Are you frequently accelerating harshly or idling for long periods of time? These actions can greatly decrease fuel efficiency. Try driving more conservatively and see if that makes a difference.

It's also possible that there is an issue with your car's engine or fuel system. Have you noticed any unusual sounds or smells? It's always a good idea to get your car checked by a mechanic to rule out any potential problems.