The Next Generation Mercedes Benz S-Class lineage will also have a plug-in hybrid version is no secret and now Mercedes is touting the S Class plug-in hybrid to fetch a whopping 81mpg. Daimler has already achieved 78 mpg (3.0 L/100km) with its Mercedes Vision S 500 plug-in hybrid at the Frankfurt event last year so therefore 81mpg for the S-Class plug-in is a step ahead. The S-Class plug-in will fetch 81mpg courtesy of a combination of 3.0-liter V-6 gasoline engine-direct injection and piezo injectors-integrated with a 44 kW electric motor. Singly, on the batteries, the semi-electric commuter will have a range of 20 miles with speeds up to 68mph. The only drawback as far as the next-generation S-Class plug-in hybrid is concerned will be its pricing.