While super-gentle acceleration keeps the vehicle in electric-only mode, it also drains the batteries quickly, often causing the gasoline engine to come on just to recharge the battery pack.

当车辆在非常缓慢的加速过程中将只使用电能，同时电量消耗非常快，常常会使汽油发动机随后只为电池组充电而启动。

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Its Volt has a backup engine to power the car when the electricity drains out.

当电能耗尽时，它有一个储备电压的发动机能给汽车带来强大的动力。

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Engine oil cannot be disposed of down drains.

发动机油不能被清理到下水道中。 。

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Controlling steering using electric motors also helps to reduce fuel consumption and hence carbon-dioxide emissions. (Electric motors require power only when the steering wheel is turned, whereas a hydraulic pump drains power from the engine all the time.) Ford reckons 90% of its cars will have electronic steering within three years.

ECONOMIST: Rational consumer