While we don't have a great deal of information available at this stage, we do know that Volkswagen is set to reveal the world's most economical non-hybrid car to shareholders attending the 42nd annual general meeting of Volkswagen AG in Hamburg.

The single-seater is capable of 0.91 litres per 100km (or 258mpg in the old measure) and can manage a top speed of 123km/h.

The prototype, as shown here, was built in conditions of such great secrecy that little more is known about the car, but we'll be sure to keep you posted after next week's meeting.