sentences:  The 1998 Audi Duo featured a parallel configuration similar to its predecessor.At the time, hybrid propulsion was considered as a promising solution to Europe's inner city emissions problems.Audi AG leased ten Duo PHEVs to Solarmobilverein Erlangen in the city of Erlangen, Bavaria as part of ELCIDIS (Electric Vehicle City Distribution), an advanced mobility project funded by the European Commission.