How to improve the fuel efficiency of my Nissan X-Trail?

I've been driving my Nissan X-Trail for a while now and I noticed that it's not as fuel efficient as it used to be. Are there any tips or tricks that can help me improve its fuel efficiency? Any maintenance I should be aware of?

Regularly check your tire pressure and make sure it's at the recommended level. Under-inflated tires can negatively affect fuel efficiency.

Keep your car well-maintained and follow the recommended service schedule. Something as simple as replacing your air filter can greatly improve fuel efficiency.

Try to avoid unnecessary idling and aggressive driving. Both of these can increase fuel consumption.