Liquified Petroleum Gas (LPG)
(A Non-renewable Resource)
In the US, LPG is currently the third most commonly used transportation fuel, behind gasoline and diesel. It is also used for home barbecues, recreational vehicle appliances, and heating and cooking in areas where natural gas is not available.
In the United States, LPG has been used mostly in fleets, including school buses in Kansas and Oregon, taxicabs in New York City, Las Vegas, and Los Angeles, sheriff and police cars, and many other on-road fleet applications. Many non-road vehicles such as industrial forklifts and farm vehicles use LPG. In Tokyo all taxis are required to run on propane to reduce urban smog. Other countries widely using LPG include Australia, Canada, the Netherlands, Italy, and Japan.
Presently, major auto manufacturers and aftermarket converters offer on-road vehicles that operate on both LPG and gasoline. These vehicles are called bi-fuel or dual-fueled vehicles, and can manually be switched between LPG and gasoline. If operation on LPG is not possible because of low fuel/low pressure, the engine will automatically switch over to gasoline without engine stall or hesitation. These vehicles have both LPG and gasoline tanks on-board. There are no new-model vehicles presently offered that operate exclusively on LPG.