How do I improve my Nissan Micra's fuel efficiency?

I've been noticing that my Nissan Micra doesn't seem to get the same gas mileage as it used to. Is there anything I can do to improve its fuel efficiency?

First, make sure your tires are properly inflated. Under-inflated tires can decrease your fuel efficiency. Also, avoid aggressive driving and try to maintain a consistent speed on the highway.

Another thing to consider is using a fuel with a higher octane rating. This can improve performance and fuel efficiency, but it may come at a higher cost.