What's the best way to maintain my Nissan Juke's fuel efficiency?

I recently purchased a Nissan Juke and I love it! However, I'm worried about maintaining its fuel efficiency. Are there any tips or tricks to help me keep my Juke running efficiently?

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

Keep your tires properly inflated. Under-inflated tires can increase fuel consumption.