The 2005 Cadillac SRX is available as a 4-door, 5-seat sport utility. Starting at $38,340, the 2005 Cadillac SRX V6 is powered by a 3.6L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 23-mpg on the highway. The top of the line 2005CadillacSRXV8 , priced at $ 50,135 , 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 21-mpg on the highway.