Revenge of the petrolheads

The Chevrolet Volt, a compact, petrol-electric hybrid launched by GM a year ago, was already selling poorly before it emerged last month that its batteries had caught fire in crash tests. GM is likely to fall several thousand short of its target of selling 10,000 Volts this year. Despite subsidies, electric cars and hybrids (which can run off batteries or a generator powered by an engine) are shifting sluggishly.

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