What is a good way to maintain the fuel efficiency of my Nissan X-Trail?

I recently bought a Nissan X-Trail and I'm worried about my fuel expenses. Are there any specific maintenance tips I should follow to ensure good fuel efficiency?

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

Consider inflating your tires to the recommended pressure. Underinflated tires can also lead to decreased fuel efficiency.