How can I improve the efficiency of my Vauxhall Astra's engine?

I own a Vauxhall Astra and I've noticed that my engine has been running a bit rough lately. Is there anything I can do to improve its efficiency and smoothness?

One thing you can do is to regularly change your engine oil and filter. This will ensure that your engine is running with clean oil, allowing it to function more efficiently.

Another tip is to check your air filter regularly and replace it if it's dirty. A clean air filter allows for better airflow, which can result in a more efficient engine.

You can also consider using a fuel system cleaner to help remove any built-up deposits in your engine. This can also improve its efficiency and performance.

Lastly, make sure to regularly check and replace your spark plugs. Old or faulty spark plugs can lead to a decrease in engine efficiency and performance.