Currently, natural gas powers more than 100,000 vehicles in the United States and millions worldwide.
Better suited for buses and taxis, natural gas is available domestically and is cheaper than gasoline and diesel.
There are three types of natural gas vehicles, dedicated, bifuel and dual-fuel. Dedicated vehicles run solely on natural gas, bifuel can operate on gasoline and natural gas and dual-fuel vehicles run on natural gas and use diesel for ignition.
Clean Cities Georgia Executive Director Don Francis says, "the fuels are cleaner; natural gas has been lower and more stable than the price of gasoline and diesel making it a good option for fleets that use a lot of fuel."