The 2006 Cadillac SRX is available as a 4-door, 5-seat sport utility. Starting at $36,270, the 2006 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 2006 Cadillac SRX V8, priced at $44,270, 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.