The 2010 Cadillac DTS is available as a 4-door, 5-seat sedan. Starting at $51,525, the 2010 Cadillac DTS Luxury Collection Sedan is powered by a 4.6L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 23-mpg on the highway. The top of the line 2010CadillacDTSFuneral Coach , priced at $ 48,180 , is powered by a 4.6L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 12-mpg in the city and 16-mpg on the highway.