The 2016 FIAT 500X is available as a 4-door, 5-seat sport utility. Starting at $20,000, the 2016 FIAT 500X Pop FWD is powered by a 1.4L , 4 -cylinder engine that returns an EPA estimated 25-mpg in the city and 34-mpg on the highway. The top of the line 2016FIAT500XTrekking Plus AWD , priced at $ 29,235 , is powered by a 2.4L , 4 - cylinder engine that returns an EPA estimated 21-mpg in the city and 30-mpg on the highway.