Propane fuel vehicles
Propane, also known as liquefied petroleum gas (LPG), has been used in vehicles since the 1920s. Today there are more than 200,000 propane vehicles in the United States and about 9 million worldwide. These include cars, pickup trucks, and vans; medium- and heavy-duty vehicles such as transit buses, shuttles, trolleys, delivery trucks, and school buses; and off-road vehicles such as forklifts and loaders. Propane vehicles can be equipped with dedicated fueling systems designed to use only propane, or bi-fuel fueling systems that enable fueling with either propane or gasoline.
Sources: Department of Energy - Office of Energy Efficiency and Renewable Energy
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