The 2019 Cadillac CT6-V is available as a 4-door, 5-seat sedan. Starting at $91,795, the 2019 Cadillac CT6-V 4.2L Blackwing Twin Turbo is powered by a 4.2L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 25-mpg on the highway.