A study done by Bridgestone Europe found that 93.5% of cars in the European Union have under-inflated tires. “Softer tires increase rolling resistance, forcing the engine to work harder – and burn more fuel. The U.S. Department of Transportation says being down just 5 to 7 pounds per square inch can decrease fuel economy by two to three miles per gallon.” Bridgestone calculated the extra fuel burned to amount to 2.14 billion gallons per year, and 18.4 million tons of extra CO2. Just for Europe.
– from wired, bridgestone
when we add the inefficiency of ic engine based vehicle (15%), its very big waste.
Check your vehicle’s air pressure once in two weeks
http://jagadees.wordpress.com/2008/05/02/under-inflated-tires-wasting-214-billion-gallons-of-fuel-each-year/