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The VW XL1 will be powered by a tiny 800cc diesel engine and a separate electric motor (SWNS)

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The 111kmpl Volkswagen XL1

March 2, 2013

After working on the idea for over a decade, Volkswagen has revealed the near-production version of the XL1, a two-seat, plug-in diesel hybrid designed to be the world's most energy-efficient automobile. VW estimates the XL1 can get up to 111 kilometre per litre — although with a time to 100 kmph of 12.7 seconds, it won't get there quickly.