The iconic Citroen 2CV (2 Chevaux or 2 horses or “deuch” or “umbrella on four wheels”) was launched in 1948 at the Paris Motor Show and went on to sell more than 4 million before production ceased in 1990.
The design criteria were for a lightweight vehicle that would enable two peasants to drive 100 kg (220 lb) of farm goods to market at 60 km/h, in clogs and across muddy unpaved roads if necessary.Fuel economy was limited 100km with 3 litres of fuel.

Sources used:

www.frome-2cv.co.uk/2cv_2.html

http://www.2cvstuff.com/2CV_models_2CV.html