How can I improve fuel efficiency in my Vauxhall Astra?

I recently purchased a Vauxhall Astra and I've noticed that I'm not getting the best fuel efficiency. What are some tips or techniques I can implement to improve my fuel efficiency and save money in the long run?

One way to improve fuel efficiency is by properly maintaining your vehicle. Make sure to regularly check and replace your air filter, as a dirty one can decrease fuel economy by up to 10%

Another helpful tip is to avoid idling your car. Letting your car run while parked not only wastes fuel, but also contributes to air pollution.

Try to drive at a steady pace and avoid sudden acceleration and braking. This can significantly improve fuel efficiency.