The 2015 Infiniti Q70L is available as a 4-door, 5-seat sedan. Starting at $51,350, the 2015 Infiniti Q70L 3.7 RWD is powered by a 3.7L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 26-mpg on the highway. The top of the line 2015InfinitiQ70L5.6X AWD , priced at $ 67,050 , is powered by a 5.6L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 23-mpg on the highway.