How to improve the fuel efficiency in my Vauxhall Grandland?

I have noticed that my Vauxhall Grandland is consuming a lot of fuel lately, what can I do to improve its fuel efficiency?

Regularly check and replace your air filter, as a clogged air filter can decrease fuel efficiency by up to 10%.

Keep your tires properly inflated, as under-inflated tires can decrease fuel efficiency by up to 3%.

Avoid aggressive driving and excessive idling, as these habits can significantly decrease fuel efficiency.

Consider using a fuel additive, as it can clean your fuel system and improve fuel efficiency.