Market overview: Which Fiat models are currently the most popular on the used car market? AutoUncle has analysed 319 used Fiat cars that are currently for sale at 44 dealerships. The three most popular Fiat models as used cars are: Punto, Grande Punto, Punto Evo. Prices start at around £525, and the average price for a Fiat on today’s used car market is £2,871.