How to improve gas mileage in a Ford Mondeo?

I recently purchased a Ford Mondeo and noticed that its gas mileage is not as good as I expected. Are there any specific tips or modifications to improve its fuel efficiency?

One thing you can do is regularly check and replace your air filter. A clogged air filter can affect your car's performance and decrease fuel efficiency.

Another tip is to keep your tires properly inflated. Under-inflated tires can increase drag and decrease gas mileage.

You can also try using a fuel additive to clean your engine and improve its efficiency.