General Motors Co. says the 40-mile (64.4-km) range of its Chevrolet Volt extended-range electric vehicle could vary by as much as 20%, depending on the climate and the basic laws of physics, which will impact its performance in mountainous regions. Andrew Farah, chief engineer for the Volt and its European sister, the Opel Ampera, says the level of comfort a passenger dials in for the car’s cabin also might affect range. “(But) the way the driver drives the vehicle, how aggressive they ...

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