Can You tell if a tire needs or has too much air just by looking at it?
A tire can be as much as 10 pounds per square inch (psi) low on air pressure and not show any outward signs. Tires will lose about one pound of pressure per month all by themselves. Not only will the correct tire pressure help tires last longer, but it can also save money on fuel costs. Underinflated tires create more rolling resistance, which uses more fuel. Checking tire pressure is easy and only takes a few minutes.