The Cadillac Converj is a CTS Coupe concept that is both eco-friendly and sleek. Recently revealed at the Detroit Auto Show, the Converj is Cadillac’s newest plug-in/fuel efficient vehicle. From just a single charge, it can be driven for up to 40 miles. Also equipped with a small gas engine that powers the electric motor, the car’s range can then reach up to 400 miles. It may not see production today, but the way fuel efficient cars are seeing more R&D, it won’t be a surprise to be able to drive one in the near future.