How do I improve my fuel efficiency on my Nissan Qashqai?

I recently bought a Nissan Qashqai and I've noticed that it's not as fuel efficient as I expected. What can I do to improve its fuel efficiency?

Firstly, make sure your tires are properly inflated. Under-inflated tires can reduce fuel efficiency. Secondly, avoid aggressive driving and excessive idling. These driving habits can significantly impact your fuel consumption. Finally, consider investing in a fuel-efficient engine oil. This could also greatly improve your Qashqai's fuel economy.