VW XL1 (2011)

This, people of Earth, is the Super Efficient Vehicle; the third iteration of Volkswagen's continuing mission to mock today's emissions regulations by creating a concept which returns 313mpg.It's powered by a two-cylinder 800cc TDI diesel producing 47bhp, and is linked to a 26bhp electric motor, equalling a total of 73bhp. The power is sent to the rear wheels via a seven-speed DSG gearbox with an automatic clutch fitted between each unit. This means the electric motor can work independently of the diesel or with it when accelerating.