The 2009 Cadillac DTS is available as a 4-door, 5-seat sedan. Starting at $49,230, the 2009 Cadillac DTS 1SB 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 2009CadillacDTSFuneral Coach , priced at $ 47,780 , 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.