The 2017 Infiniti Q50 Hybrid is available as a 4-door, 5-seat sedan. Starting at $47,800, the 2017 Infiniti Q50 Hybrid RWD is powered by a 3.5L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 27-mpg in the city and 32-mpg on the highway. The top of the line 2017InfinitiQ50 HybridAWD , priced at $ 49,800 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 26-mpg in the city and 30-mpg on the highway.