Fuel Saving Tips

Add air to tires during low humidity weather

The more water vapor in your tires, the more variation there will be in air pressure between cold and hot temperatures. A science experiment from grade school proves this - add steam to a can, seal it, then freeze it. The can collapses. Most air compressors do not have a dryer. Therefore, the water vapor in the air is compressed into your tire along with other atmospheric gasses. A proposed solution is to always add pure nitrogen, which does not contain water vapor. However, this can be inconvenient and costly. A "free" answer is to practice adding air to your tires when the dewpoint is low during cold months or on relatively dry days in the summer. If you believe you have a lot of water vapor in your tires now, you could let out most of the air in your tire after they are hot from a highway drive on a dry day, then add new air back up to the proper pressure.