What is the best way to increase fuel efficiency in the Nissan X-Trail?

I recently purchased a Nissan X-Trail and have noticed that my fuel costs are quite high. Any advice on how I can improve my fuel efficiency without sacrificing performance?

Regularly checking and replacing your air filter can greatly improve fuel efficiency. This simple task can save you money in the long run.

Try to avoid heavy acceleration and braking as much as possible. This not only improves fuel efficiency, but also prolongs the life of your brakes.