21.   Hybrid vehicles now marketed by Toyota and Honda, and planned by many other manufacturers, are fueled only with gasoline.

22.   Hybrid vehicles that rely on electricity and gas already are affordable and will only get cheaper in the next year, VanAmburg said.

23.   Last year, GM and Toyota formed a manufacturing partnership to include research and development on fuel-cell and gas-electric hybrid vehicles.

24.   Many other companies are working on hybrid vehicles.

25.   Low-emission hybrid vehicles and electric cars are on the roads now, and the potential for hydrogen-powered fuel cell vehicles is even greater.

26.   Rescuing the occupants of hybrid vehicles after crashes could also prove tricky.

27.   Several automakers have hybrid vehicles on their drawing boards because they are not solely dependent on batteries and emissions are reduced with the relatively smaller combustion engines.

28.   That would push automakers to expand production of hybrid vehicles that combine gas and electric propulsion.

29.   The Bush administration has already said that it supports tax credits for hybrid vehicles, which are highly fuel efficient.

30.   The electric motor of a hybrid electric vehicle runs off a battery that is in turn charged by the gasoline engine.