 The advanced space efficient designs with very compact exterior dimensions and an aerodynamic drag co-efficient Cd of 0.32, were axed because of adverse feedback from potential clients.The goal of Prototype Y was to give birth to a small, robust and modern car which would have fitted into the Citroën range between the 2CV and the GS.The first prototypes were based on the Fiat 127 platform, since Citroën was pursuing at that time an alliance with Fiat (the only result of this alliance in the end was the Citroën C35 / Fiat 242).