The 2008 SRX is a 4-door, up to 7-passenger luxury sport-utility, available in two trims, the V6 and the V8.Upon introduction, the V6 is equipped with a standard 3.6-liter, V6, 255-horsepower engine that achieves 16-mpg in the city and 23-mpg on the highway. A 5-speed automatic transmission with overdrive is standard. The V8 is equipped with a standard 4.6-liter, V8, 320-horsepower engine that achieves 15-mpg in the city and 21-mpg on the highway. A 6-speed automatic transmission with overdrive is standard.