Increasing Tire Pressure

To get the most out of your gas, you should pump up those tires, some say. While driving on underinflated tires can cost you 3.75 per cent in fuel economy, overinflating tires can be downright dangerous, since it reduces your grip on the road and could cause an accident. Proper tire inflation is important for safety and longevity of your tires, but don't expect any significant gas savings there.