What is the best way to improve fuel efficiency on a Vauxhall Astra?

I recently purchased a Vauxhall Astra and I've noticed that it's not as fuel efficient as I expected. Are there any tips or tricks on how I can improve its fuel efficiency?

Regularly servicing your Astra, including replacing air filters and spark plugs, can greatly improve its fuel efficiency.

Driving at a consistent speed and avoiding frequent braking and accelerating can also help improve fuel efficiency.

Make sure your tires are properly inflated and aligned. This can have a significant impact on fuel efficiency as well.