Why is the Ford Fiesta's fuel economy decreasing?

I have noticed that my Ford Fiesta's fuel economy has been decreasing over the past few months. I keep up with regular maintenance and don't drive excessively, so I am not sure what could be causing this. Any advice on how to improve my fuel economy?

It could be a number of things causing your decrease in fuel economy. Check your tire pressure to make sure they are properly inflated, as this can greatly affect fuel efficiency. It may also be time for a tune-up, or there could be a problem with your fuel injectors. I suggest taking your car to a trusted mechanic for a diagnostic check.

Are you using the recommended grade of gasoline for your Ford Fiesta? Using a lower grade can cause a decrease in fuel efficiency. Also, make sure your air filter is clean and your oil is changed regularly. These small things can make a big difference in your car's performance.

My Ford Fiesta had a similar issue and it turned out to be a faulty O2 sensor. This caused my car to burn more fuel than usual. I would suggest getting your O2 sensors checked and replaced if necessary.