The 2008 Cadillac SRX is available as a 4-door, 5-seat sport utility. Starting at $38,105, the 2008 Cadillac SRX V6 4x2 is powered by a 3.6L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 22-mpg on the highway. The top of the line 2008CadillacSRXV8 AWD , priced at $ 45,105 , 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 20-mpg on the highway.