Why does my Vauxhall Grandland's fuel economy seem lower than advertised?

I recently purchased a Vauxhall Grandland and I noticed that the fuel economy is not as good as what the manufacturer advertised. Can anyone explain why this might be happening?

From my experience, the advertised fuel economy is determined under ideal conditions that may not reflect real world driving scenarios. Have you tried adapting your driving style to be more fuel efficient?

Make sure your tire pressure is at the recommended level. Low tire pressure can significantly affect fuel economy.

Check if your air filter needs to be replaced. A dirty air filter can cause a decrease in fuel efficiency.