A tire pressure warning system has an air pressure detecting device 3, a low pressure warning display unit 5 and a fuel consumption deterioration warning display unit 4. The air pressure detecting device 3 detects an air pressure of each tire 2 of a vehicle. The low pressure warning display unit 5 warns...http://www.google.com/patents/US7132938?utm_source=gb-gplus-sharePatent US7132938 - Tire pressure warning system
