Plug-in hybrid vehicles claim to be much more fuel efficient, and thus cheaper to run, than regular models powered only by international combustion engines.
There’s no such thing as a free lunch, though; in the case of plug-in hybrids, you have to factor in the energy consumed to charge the battery at your home, which adds to the electricity bill.
General Motors’ OnStar service is currently testing an application that will inform Chevrolet Volt owners about the cost of charging their extended-range plug-in hybrid.
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