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

I recently purchased a Ford Focus and I've noticed that I'm not getting the best gas mileage. What are some tips or tricks I can use to improve the car's fuel efficiency?

One way to increase fuel efficiency is by keeping your tires properly inflated. This will reduce the amount of drag and improve gas mileage.

Avoid excessive idling and drive at a steady speed to maximize fuel efficiency.

Using cruise control during highway driving can also help save on gas.