The 2008 Cadillac DTS is available as a 4-door, 5-seat sedan. Starting at $46,675, the 2008 Cadillac DTS 1SC 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 2008CadillacDTSFuneral Coach , priced at $ 44,675 , is powered by a 4.6L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 18-mpg on the highway.