Propane is used to fuel internal combustion engines in the form of propane autogas. Propane autogas is a very practical solution for reducing vehicle emissions, as well as for reducing the United States' dependence on foreign oil. LPG-fueled vehicles produce fewer toxic emissions and smog-forming air pollutants. Autogas is widely used as a "green" fuel because of these decreases in exhaust emissions. Tests conducted by the U.S. Environmental Protection Agency show that propane-fueled vehicles produce 30% to 90% less carbon monoxide and approx 50% fewer toxins and other smog-producing emissions than gasoline engines.


The Report of Alternative Fuels Group of the Cleaner Vehicles Task Force measured the emissions reduction of propane-powered vehicles in the following table, showing percentage emissions reduction in Light-Duty (LDV) and Heavy-Duty Vehicles (HDV):


Emissions of Manufactured Propane Vehicles


Percent Reduction: LDV

Percent Reduction: HDV

Total Hydrocarbons (THC)














A special "thank you" to the Propane Education and Resource Council for helping us fund the Liberator 6.0L Propane Autogas Engine project.