The 2002 Infiniti QX4 is available as a 4-door, 5-seat sport utility. Starting at $34,150, the 2002 Infiniti QX4 4x2 is powered by a 3.5L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 19-mpg on the highway. The top of the line 2002InfinitiQX44x4 , priced at $ 35,550 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 18-mpg on the highway.