What is the best way to maintain the fuel efficiency of a Ford Fiesta?

My Ford Fiesta's fuel efficiency has decreased recently and I'm not sure why. I want to know what I can do to maintain it properly.

Regularly check your tire pressure and make sure they are properly inflated. This can greatly affect your fuel efficiency.

Don't accelerate too quickly and avoid sudden braking. This will help you save gas in the long run.

Make sure you get your oil changed on time and use the recommended type of oil for your Ford Fiesta. This can improve your fuel efficiency.