How to improve fuel efficiency in a Nissan X-Trail?

I recently bought a Nissan X-Trail and noticed that the fuel consumption is higher than advertised. What are some tips to improve the fuel efficiency of my car?

Regularly maintain your car by replacing air filters and spark plugs. This can greatly improve fuel efficiency.

Avoiding aggressive driving and speeding can also help save fuel. Slow down and maintain a steady speed while driving.

Checking your tire pressure regularly can also improve fuel efficiency. Underinflated tires can lead to more fuel consumption.