With concerns about the environment continuing to mount, there have been increasing efforts to find viable options to the two big traditional motor fuels: gasoline and diesel—from alternative fuels, alternative fuel vehicles and alternative fuel sources.

Propane autogas has grown to be the third most widely used motor fuel, behind only gasoline and diesel. Today, there are hundreds of thousands of vehicles in the U.S. that have been manufactured or converted to use autogas.

New York businesses, municipalities and school districts that are just becoming aware of propane autogas understandably want to dig deeper and understand how it compares with other motor fuels, not only in terms of cost efficiency but also safety.

When you use propane autogas, you can choose between five types of refueling options. Here’s a closer look.

According to a recent study by West Virginia University’s Center for Alternative Fuels, Engines and Emissions, propane autogas is a proven way to dramatically decrease emissions of toxic nitrogen oxides (NOx).