Volkswagen have halted development of a super efficient vehicle. The two seater had a 300cc diesel engine and super light frame and could manage 60 miles per litre. However it lacked luggage space and was going to be too expensive to produce. It’s sort of a loss and not a loss. VW are still producing the Lupo TDI, which does 20 miles per litre. Combine that with biodiesel and you could be onto a winner.