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

I just bought a Ford Mondeo and I love everything about it except for the fact that it drinks too much fuel. Can anyone suggest some tips or modifications to improve its fuel efficiency?

Regularly servicing your car can greatly improve its fuel efficiency. Make sure to change the air filter, spark plugs, and fuel filter regularly.

Inflate your tires to the recommended pressure to reduce rolling resistance and improve fuel economy.

Avoid idling for long periods of time and try to combine your errands into one trip to save on fuel.