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A WCF source has sent us exclusive information about the Mercedes Vision S 500 plug-in hybrid.

Set to be officially unveiled at the Frankfurt Motor Show, the concept will feature a V6 petrol engine connected to an advanced lithium-ion battery that has a storage capacity of more than 10 kWh. This unique setup will allow the S-Class to travel up to 30km (18.6 miles) on electricity alone. When the battery is depleted, the 44 kW (60 hp) hybrid module will activate the petrol engine. While the specifics are still kind of murky, the car will rocket from 0 to 100 km/h in 5.5 seconds.

In terms of efficiency, the Vision S 500 plug-in hybrid will consume just 3.2L/100km (73.5 mpg) while emitting 74 grams of CO2/100km. This easily beats the Fisker Karma's estimated rating of 3.5L/100km (67.2 mpg) and 83 grams of CO2/km.

According to Dr. Dieter Zetsche, Chairman of Daimler AG and Head of Mercedes-Benz Cars, "The Vision S 500 HYBRID is a new milestone on our path toward zero-emission mobility. It is a luxurious and safe S-Class vehicle that offers superior driving performance while at the same time consuming less fuel than current compacts. All of this shows that our top models will also be able to combine automotive fascination with responsibility for the environment."

Look for more information to be released when the car officially debuts in Frankfurt.

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