How to maintain the Nissan Patrol's fuel efficiency?

Recently, I've noticed a decrease in my Nissan Patrol's fuel efficiency. I've been following the regular maintenance schedule and driving responsibly. Any tips on how to improve my car's fuel efficiency?

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

Make sure your tires are properly inflated. Underinflated tires can cause your car to use more fuel.