MB is promoting their own answer to the Volt

The Mercedes-Benz Concept BlueZERO E-Cell Plus PHEV combines environmentally friendly electric mobility in the city with unrestricted suitability for long-distance driving. This is made possible by the combination of the battery-electric drive with a small combustion engine. The range extender gives the BlueZERO E-Cell Plus a total range of up to 360 miles with 60 miles solely on electric power alone.