How to improve fuel efficiency in my Ford Mondeo?

I have noticed that my Ford Mondeo's fuel efficiency has been decreasing. What steps can I take to improve it and save on gas expenses?

Regularly check and replace your air filter, as a dirty air filter can decrease fuel efficiency.

Make sure your tires are properly inflated, as under-inflated tires can lead to decreased fuel efficiency.

Cruise control can help maintain a consistent speed and improve fuel efficiency on long drives.