The 2016 Infiniti Q50 is available as a 4-door, 5-seat sedan. Starting at $33,950, the 2016 Infiniti Q50 2.0t Base RWD is powered by a 2.0L , 4 -cylinder engine that returns an EPA estimated 23-mpg in the city and 31-mpg on the highway. The top of the line 2016InfinitiQ503.0t Sport RWD , priced at $ 43,900 , is powered by a 3.0L , 6 - cylinder engine that returns an EPA estimated 19-mpg in the city and 28-mpg on the highway.