Tyre pressure is of critical importance for two basic reasons. Having properly inflated tyres protects against tyre damage and reduces the possibility that the car will spin out of control. Driving with low pressure tyres also increases fuel consumption. You should check your tyre pressure at least every month, more often if you drive many kilometres and always before setting out on any long journey. Tyres should not be hot when checked, otherwise add 4 to 5 PSI to the recommended pressure. To find the correct tyre pressure for your car, check the user manual, the label on the door or inside the fuel flap. The recommended pressure is not written on the tyre itself.