The 2017 Infiniti QX80 is available as a 4-door, 7-seat sport utility. Starting at $63,850, the 2017 Infiniti QX80 Base 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 2017InfinitiQX80Signature Edition AWD , priced at $ 70,435 , 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.