11.   Less power than a gas engine.

12.   Moreover, the batteries can be recharged automatically using power from the gas engine or from braking, so hybrids do not have to be plugged in.

13.   So the Prius will disengage the gas engine from the transmission and feed all its power to the electric generator.

14.   The CCV has a prototype direct-injection, four-cylinder gas engine.

15.   The gas engine is less noisy but even thirstier.

16.   The gas engine either propels the car or charges the battery.

17.   The Prius, which does not idle, has a gas engine to charge its batteries or power its wheels.

18.   These cars house their small gas engines under swooping hoods and add spoilers in front of the wheels to minimize wind resistance.

19.   When decelerating before a stop, the gas engine switches off and the electric motor takes over again.

20.   When it is running, the gas engine recharges the batteries, so the Prius does not require an external charger.