What is the best way to improve gas mileage in a Ford Fiesta?

I just bought a Ford Fiesta and I'm looking for ways to save money on gas. What can I do to improve the gas mileage on my car? Any specific tips or tricks?

Regularly check and replace your air filter - a dirty air filter can decrease gas mileage.

Inflate your tires to the recommended pressure - proper tire inflation can improve gas mileage by up to 3%.

Avoid idling for long periods of time - turn off your engine if you're going to be stuck in traffic or waiting for someone.

Drive smoothly and maintain a consistent speed - rapid acceleration and braking decreases gas mileage.