Bi-Fuel A vehicle that has two fuel systems designed to run on either an alternative fuel or conventional fuel, but only one fuel at a time. Duel-Fuel A vehicle that runs on a combination of alternative and conventional fuel simultaneously. The vehicle has two separate fuel systems that inject both fuels. Natural gas has an octane rating of 130 which enables higher compression rations to be obtained. Natural gas burns much cleaner than gasoline, resulting in reduced emission levels, less contamination of engine oil, and longer engine life.
Natural gas is safer than gasoline.
It requires a higher ignition temperature and greater concentration to ignite. Natural gas is less expensive than gasoline. Vehicles can be converted to run on natural gas. Other than compressing natural gas for storage, it is used by motor vehicles exactly as it comes from the delivery system. No additional cost of refining is needed.