Natural gas is a gaseous combination of hydrocarbons, typically heavy on methane. Technically, natural gas is a fossil fuel, and it is considered a nonrenewable resource as a result. However, natural gas is fairly abundant and is generally cheaper than gasoline. In addition, it burns much more cleanly than gasoline, making it a better choice for vehicle fueling since it can dramatically reduce emissions. In some cases, an NGV can run on biofuel, a renewable form of natural gas made from biological material such as manure. by wisegeek
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