How to improve the fuel efficiency in a Ford Fiesta?

I have noticed that my Ford Fiesta's fuel efficiency has been decreasing lately. Any tips on how to improve it?

One way to improve fuel efficiency in a Ford Fiesta is to regularly check and replace the air filter. A clogged air filter can decrease fuel efficiency by up to 10%. Make sure to follow your car's recommended maintenance schedule for air filter replacement.

Another tip is to decrease your speed while driving. Driving at high speeds can significantly decrease fuel efficiency. Stick to the speed limit and avoid aggressive acceleration and braking.