The 2018 FIAT 500X is available as a 4-door, 5-seat sport utility. Starting at $19,995, the 2018 FIAT 500X Pop FWD is powered by a 1.4L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 25-mpg in the city and 33-mpg on the highway. The top of the line 2018FIAT500XLounge AWD , priced at $ 27,415 , is powered by a 2.4L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 29-mpg on the highway.