How can I improve fuel efficiency in my Nissan Micra?

I've been noticing that my Nissan Micra's fuel efficiency isn't as good as it used to be. Are there any tips or tricks I can use to improve it?

Make sure your tires are properly inflated. Underinflated tires can decrease fuel efficiency.

Avoid aggressive driving and speeding. This burns more fuel.

Try to avoid idling. If you're going to be stopped for more than a minute, turn off your engine.