The Chevrolet Volt, and its clever range-extender plug-in hybrid system marked a turning point in the way GM viewed green cars, and while the American giant may have tested the market in the past, it is the first of its kind to actually make an impact.
However, one can't help but wonder if the 1.4-liter petrol engine used to recharge the battery was chosen for its efficiency credentials, or due to cost constraints - the Volt is quite expensive, as it is.
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