It is a common mistake to forget to check the air pressure in ones tires because, from the looks of it, the tires are properly inflated. Looks can be deceiving. Even when tires appear to be properly inflated, they could be low on air. While the tires may not blow out, low tire pressure could lead to poor fuel economy so your wallet could still be affected. It is also easy for tires to lose air pressure – as easy as running over a pothole. The weather outside has a big effect on your tire pressure. Tires lose 1 to 2 lbs. of air pressure for every 10° the temperature drops outside. Therefore, it is best to check your tire pressure regularly because you never know when it might be low. After all, the last thing you want is a flat tire and/or poor gas mileage.