If you have a newer Ford Fusion, it will be equipped with a tire pressure monitoring system (TPMS), which electronically checks your tire pressure and alerts you if something is awry.
However, if your TPMS isn’t working, or you just want to check your tire pressure by hand, you can use a simple gauge. In a safe place (such as your driveway or a gas station parking lot), remove the valve cap on each of your tires and press the pressure gauge onto the valve stem. This should quickly provide a reading.
You can determine what your tire pressure should be by checking your owner’s manual, the sticker on your door jam, or the sticker behind your gas cover door.
Try to check your tire pressure on a regular basis—at least monthly, as well as after every long road trip.