For lots of information about buying and maintaining a Twingo in the UK go to Twingo Club GB
Regression Analysis (spreadsheet)
Magic Numbers: £xxxx less £xxx per year, and less £xx per 1,000km.
As there are relatively few Twingos for sale in the UK the regression analysis is not very reliable, so try analysing prices of a 1.2 litre Clio to yield a useful set of magic numbers.
A list of known problems could be found at Twingo's Black Book. [a geocities site so beware of pop-up windows.]