Natural Gas Vehicles 
Compared with vehicles fueled with conventional diesel and gasoline, natural gas vehicles (NGVs) can produce significantly lower amounts of harmful emissions. In addition, some NGV owners report service lives two to three years longer than gasoline or diesel vehicles and extended time between required maintenance.

The driving range of NGVs is generally less than that of comparable gasoline - and diesel-fueled vehicles because of the lower energy content of natural gas. Extra storage tanks can increase range, but the additional weight may displace payload capacity. NGV horsepower, acceleration and cruise speed are comparable with those of an equivalent conventionally fueled vehicle.

Worldwide, there were 11.4 million natural gas vehicles by 2009, led by Pakistan with 2.5 million, Argentina (1.8 million), Iran (1.7 million), Brazil (1.6 million) and India (935 thousand). The United States has 110,000 NGVs, mostly buses. 

For more information, visit the Department of Energy website
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