Hybrid cars like the Toyota Prius offer drivers the choice of using gasoline or electricity as a power source. Future hybrid technology will offer increases in efficiency for electric motors, batteries and gas- or diesel-powered engines.
Why hybrid cars are the future?
For these simple reasons, the hybrid of the future will have an engine that has substantially less power than the electric motor. The engine will be responsible for most constant speed driving, while the electric motor will provide the short bursts of larger power required by acceleration and steep hills.