The 2021 Cadillac CT4 is available as a 4-door, 5-seat sedan. Starting at $33,395, the 2021 Cadillac CT4 Luxury RWD is powered by a 2.0LL , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 23-mpg in the city and 34-mpg on the highway. The top of the line 2021CadillacCT4V-Series AWD , priced at $ 44,895 , is powered by a 2.7LL , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 28-mpg on the highway.