In this next maintenance tutorial, you'll be finding out two things on how to improve the performance of your car. One is how to check the car's tire pressure. During a time where gas is expensive, tire pressure can help you save money and time at the pump. It's easy to do and can be checked in a matter of minutes. The other bit of information is more of a question. Which is better for tires? Nitrogen or oxygen. You may be surprised by the answer. So check out the tutorial above on how to check your cars tire pressure and if you should use nitrogen or oxygen. Good luck and enjoy!