Fiat is up 26-fold on May 2017 and the Uno breaks into the Top 20. * See the Top 30 best-selling brands and Top 50 models by clicking on the title * New vehicle sales in Colombia gain 3.4% year-on-year in May to 20.589 units, lifting the year-to-date volume up 2% to 95.167. Chevrolet (-4%) rem