What is the best way to improve the efficiency of a Ford Fiesta engine?

I've noticed that my Ford Fiesta's engine is not performing as well as it used to. What are some simple steps I can take to improve its efficiency and performance?

Hey Samantha, have you considered getting a tune-up for your Ford Fiesta? That can significantly improve its efficiency.

Changing your air filter regularly can also improve your Ford Fiesta's engine efficiency, Samantha.

Another way to improve your Ford Fiesta's engine is to use higher octane gasoline. It may be more expensive, but it can make a difference.