The 2016 Cadillac CT6 is available as a 4-door, 5-seat sedan. Starting at $55,495, the 2016 Cadillac CT6 3.6L Standard AWD is powered by a 3.6L, 6-cylinder engine that returns an EPA estimated 18-mpg in the city and 27-mpg on the highway. The top of the line 2016 Cadillac CT6 3.0L Twin Turbo Platinum AWD, priced at $87,465, is powered by a 3.0L, 6-cylinder engine that returns an EPA estimated 18-mpg in the city and 26-mpg on the highway.