The 2020 Infiniti Q50 is available as a 4-door, 5-seat sedan. Starting at $36,400, the 2020 Infiniti Q50 3.0t PURE RWD is powered by a 3.0LL , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 29-mpg on the highway. The top of the line 2020InfinitiQ50EDITION 30 AWD , priced at $ 45,700 , is powered by a 3.0LL , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 27-mpg on the highway.