Why is the fuel efficiency of my Nissan Micra decreasing?

I recently noticed that my Nissan Micra's fuel efficiency has been decreasing. I've been filling up the tank more frequently than before. Is there something wrong with my car or am I doing something wrong?

It's possible that there could be a problem with your car's engine or fuel system. I recommend taking your Nissan Micra to a certified mechanic for a thorough inspection and potential repairs.

Have you been driving more frequently or in heavier traffic than before? These factors can significantly impact your fuel efficiency. Also, have you made any changes to your driving habits, such as accelerating aggressively or idling for extended periods of time?