What is the best way to maintain the fuel efficiency in my Nissan Patrol?

I recently purchased a Nissan Patrol and I want to make sure that I am doing everything I can to maintain its fuel efficiency. Can you give me any tips or advice?

Regularly check and replace air filters to ensure proper air flow into the engine. This can greatly impact fuel efficiency.

Avoid fast acceleration and maintain a steady speed while driving on highways. This can help save fuel.