It is easily transported through pipelines and costs about the same or slightly less than gasoline. But CNG fuel must be stored under pressure in heavy tanks, and the cost of accommodating these tanks must be considered. Natural gas is being successfully used in transit and school bus fleets and is an excellent alternative to conventional diesel technology. Pure ethanol fuel offers excellent performance, plus low hydrocarbon and toxic emissions. With current technology and price structures, ethanol is more expensive than gasoline.
New technologies offer the hope of significantly reduced costs.
It can be produced at prices comparable to gasoline from natural gas and can also be produced from coal and wood. Many auto manufacturers have developed advanced M100 prototypes. Methanol has long been the fuel of choice for race cars because of its superior performance and fire safety characteristics. Propane Propane, or liquefied petroleum gas, is a by-product of petroleum refining and natural gas production. It burns cleaner than gasoline but is limited in supply.