Current and future emission standards in the USA has provided motivation for development of alternative energy vehicles. Hybrid-electric (HEV), fuel cell (FCV) and electric vehicles (EV) are under development. HEVs and FCVs are capable of operation on commercially available fuels and have long enough range. Present day gasoline and diesel engines are strong contenders for use as prime movers for HEVs. FCVs with on-board fuel-reformers to produce hydrogen are under development for commercial production in the next few years.