The 2016 Infiniti Q50 is a 4-door, 5-seat Sedan, available in 10 trims, ranging from the 2.0t Base RWD to the 3.0t Sport RWD. Upon introduction, the $33,950 2.0t Base RWD is equipped with a standard 2.0L, 4-cylinder, engine that achieves 23-mpg in the city and 31-mpg on the highway. an Automatic transmission is standard. The $43,900 3.0t Sport RWD is equipped with a standard 3.0L, 6-cylinder, engine that achieves 19-mpg in the city and 28-mpg on the highway. an Automatic transmission is standard.