An estimated 93.5 percent of motorists in the EU are driving on under-inflated tires and causing an additional 84 million tons of carbon dioxide to be released into the environment. These 84 million tons are the equivalent of 56 million tires being wasted. To collect this data, Bridgestone conducted free check-ups at various shopping centers and public car parks throughout Europe. Based on 2006 data, Bridgestone also estimates 40 percent of vehicles absorb an additional 2.8 percent in fuel, due to their under-inflated tires, wasting 8.1 billion liters (2.14 billion gallons) of fuel every year.