Why is the fuel economy of my Nissan Qashqai decreasing?

I've had my Nissan Qashqai for about a year now and I've noticed that the fuel economy has been steadily decreasing. What could be causing this and what steps can I take to improve it?

One possible reason for the decrease in fuel economy could be due to driving habits. Make sure you are not accelerating or braking aggressively and try to maintain a steady speed. This can help improve your fuel efficiency.