Volkswagen Chairman Dr. Ferdinand Piech arrived at this week's annual VW shareholders meeting in a remarkable little car.VW's new 'One Liter' concept car is designed to burn less than one liter of fuel over 100 kilometers.On Sunday's three hour drive from VW's Wolfsburg headquarters to Hamburg, it did that and more, averaging 0.89 liters per 100km (239 miles per gallon) in traffic.Yes, it's already licensed for use on public roads, comes complete with airbags, anti-lock brakes and other modern comforts--and can cruise at 75 mph all day.Perhaps most suprising, given that the car's novel direct-injection single cylinder engine makes only...