The 2004 Cadillac DeVille is available as a 2-door, 3-seat hearse. Starting at $45,600, the 2004 Cadillac DeVille Base is powered by a 4.6LL , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 26-mpg on the highway. The top of the line 2004CadillacDeVilleArmored Deville - 8 Stretch w/WC8 Coachbuilder Lim , priced at $ 133,200 , is powered by a 4.6LL , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 21-mpg on the highway.