Fuel

Air pollution from vehicle exhaust emissions is the end result of burning fuels to power the car. This has caused much environmental concern. Gasoline has been the dominant fuel since the invention of the automobile, although other fuels have been tried—some, such as diesel oil and liquefied petroleum gas (LPG) or propane, with considerable success. Others have been experimented with primarily because of their lower or less-harmful emissions. On the whole, consumers have limited choice in what fuels to buy, yet lack of consumer demand is often used by suppliers to justify not offering alternatives. Growing environmental pressure is increasingly leading regulators to mandate new and improved fuel types. Although conventional gasoline and diesel fuels will be with us for several more years, their dominant ...