Troubleshooting Corsa's Fuel Efficiency

My Vauxhall Corsa has been experiencing a decrease in fuel efficiency lately. I'm not sure what could be causing this issue. Any suggestions on how to troubleshoot this?

First, check your tire pressure. Underinflated tires can greatly impact fuel efficiency. Additionally, make sure you are not carrying excess weight in your vehicle.

Check your air filter. A dirty air filter can restrict airflow and reduce fuel efficiency. It is recommended to replace your air filter every 12,000 miles.

If the above suggestions don't improve your fuel efficiency, it may be time to take your Corsa to a mechanic. There could be an underlying issue with your engine or fuel system that needs to be addressed.