The 2020 Infiniti QX80 is available as a 4-door, 7-seat sport utility. Starting at $66,750, the 2020 Infiniti QX80 4x2 is powered by a 5.6L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway. The top of the line 2020InfinitiQX80LIMITED AWD , priced at $ 91,450 , is powered by a 5.6L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 19-mpg on the highway.