It is unlikely to come as news to any owner of a plug-in hybrid car that their fuel economy is nowhere near as impressive as claimed. Typically marketed as a cleaner, greener alternative to internal combustion engine cars and a transitional alternative to fully electric vehicles, they are also billed as cheaper to run, as the driver has the option of using the small electric battery for short journeys rather than the petrol or diesel engine. Yet a new study by consumer group Which? suggests that these cars in fact use up to four times as much fuel as advertised, leading to far higher running costs and increased emissions.
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