The Volkswagen L1 concept is a breakthrough for fuel efficiency and roof-opening doors. Its carbon fibre reinforced body weighs just 124kg, and it has a maximum speed of 160kph. But the best bit, the L1 consumes just 1.5l of diesel per 100km. Again, it’s just a concept, and probably won’t see the bright light of a summer’s day, but we don’t care. How cool is that fighter pilot-esque seating inside?