The 2007 Cadillac SRX is available as a 4-door, 5-seat sport utility. Starting at $37,225, the 2007 Cadillac SRX V6 4x2 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 24-mpg on the highway. The top of the line 2007CadillacSRXV8 AWD , priced at $ 45,330 , 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 22-mpg on the highway.