How to increase fuel efficiency in a Vauxhall Astra?

I recently bought a used Vauxhall Astra and noticed that it's not as fuel efficient as I expected. What are some ways to improve its fuel efficiency?

Regularly check and replace your air filter to ensure proper air flow and fuel combustion.

Keep your tires properly inflated to improve gas mileage and reduce wear and tear on the engine.

Avoid aggressive driving and stick to speed limits to minimize fuel consumption.