How to increase the fuel efficiency of a Vauxhall Astra?

I'm struggling with the fuel efficiency of my Vauxhall Astra. I've tried various techniques, but nothing seems to work. Can someone please give me some advice on how to improve it?

One thing you can do is make sure you're properly maintaining your car. This means regularly changing your oil and air filters, keeping your tires properly inflated, and getting your car serviced regularly.

You could also try using a fuel additive, such as a fuel cleaner or octane booster. These can help improve the combustion and efficiency of your engine.

Another tip is to avoid aggressive driving, such as speeding and sudden acceleration. This burns through fuel quickly and can significantly decrease your fuel efficiency.

Lastly, try to reduce the weight in your car. Remove any unnecessary items from your trunk and avoid carrying heavy loads. This will put less strain on your engine and improve your overall mileage.