What is the best way to improve the fuel efficiency of my Ford Focus?

I recently purchased a Ford Focus and I've noticed that the fuel efficiency is not as good as advertised. What are some tips and tricks I can use to improve the fuel efficiency of my car?

Keeping your tires properly inflated can greatly improve your gas mileage. Make sure to check them regularly and inflate them to the recommended pressure.

Avoiding aggressive driving, such as quick acceleration and braking, can also help improve fuel efficiency. Try to maintain a steady speed while driving.

Regular maintenance, such as oil changes and tune-ups, can also have a significant impact on fuel efficiency. Make sure to follow the recommended maintenance schedule for your Ford Focus.