How to improve fuel efficiency in the Vauxhall Zafira Life?

I recently purchased a Vauxhall Zafira Life and I've noticed that it's not as fuel efficient as I expected. What are some tips or modifications I can make to improve its fuel efficiency?

Regularly check and replace your air filter. A dirty air filter can decrease fuel efficiency.

Ensure your tires are properly inflated. Under-inflated tires can decrease fuel efficiency.

Avoid idling for long periods of time. This wastes fuel and decreases efficiency.