Honda's DN-X Concept car hit the world stage at the New York Motor Show in April, with a sportscar body and four doors. That's not the radical bit though - the 400bhp power-train feeds all four wheels and consists of a 3.5 litre V6 and an advanced Electric Motor Assist system which provides the supplemental torque of an electric motor to accelerate, delivering around 15 kilometres per litre fuel consumption.