you have to watchout for gross politics though, I tried moving towards some other fuel and dmv started shoving laws in my face that serve no other purpose but to perpetuate gasoline industry... can't have natural gas in your personal car, can't have cng or liquified propane gas unless your car is over like 12 tons or some crap, can't register your personal alternative fuel automobile without paying an extra 300 something in registration every year for the gasonline tax that you aren't paying anymore.