What is the best way to increase the fuel efficiency on a Ford Focus?

I recently purchased a Ford Focus and noticed that I am not getting the advertised fuel efficiency. What can I do to improve it?

One of the best ways to increase fuel efficiency on a Ford Focus is to make sure that your tires are properly inflated. Underinflated tires can increase drag and decrease fuel efficiency.

Another way to improve fuel efficiency is to avoid idling for long periods of time. If you are waiting in your car for more than 30 seconds, it is more fuel-efficient to turn off the engine and restart it later.