This is the latest version of VW's tandem L1 project, so-called because of its ability to travel 100km on one litre of fuel.
The two-seater was due to be unveiled at the Frankfurt motor show on Tuesday, but early pictures and details were revealed by the German media over the weekend.
The reports suggest the car, which is powered by a 29bhp two-cylinder diesel linked to a seven-speed DSG gearbox and weighs around 380kg, will achieve 189.6mpg.
VW originally showed a one-litre concept in 2002, although the exotic lightweight materials used to build it made it to expensive to consider for production.
Thanks to: Autocar