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Diesel is renowned for its fuel efficiency when running at a constant rate, hence diesel vehicle's great fuel economy on the highway. Utilising a diesel engine as a range-extended for the on-board battery pack should yield exceptional diesel fuel efficiency as well as near-zero emissions for shorter trips which utilise the batteries only. It looks like Volvo's the latest to get in on the plug-in hybrid action, with it showing off its new ReCharge concept vehicle in anticipation of next week's Frankfurt Motor Show. Volvo aficionados will likely recognize the vehicle as being based on the company's C30 hatchback, which gives it an all-wheel drive propulsion system.