The 2021 Infiniti QX80 is available as a 4-door, 7-seat sport utility. Starting at $69,150, the 2021 Infiniti QX80 LUXE 4x2 is powered by a 5.6LL , 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 2021InfinitiQX80SENSORY AWD , priced at $ 83,400 , is powered by a 5.6LL , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 19-mpg on the highway.