The 2017 Cadillac ATS is available as a 4-door, 5-seat sedan. Starting at $34,595, the 2017 Cadillac ATS 2.0L Turbo Base RWD Sedan is powered by a 2.0L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 22-mpg in the city and 31-mpg on the highway. The top of the line 2017CadillacATS3.6L Luxury , priced at $ 00 , is powered by a 3.6L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 27-mpg on the highway.