The Range has a roots type blower, which makes torque at a relatively low rpm. Torque is what gets these heavy things moving, but horsepower is what keeps it moving. The blower makes more torque, and that makes it accelerate harder than our 4.8i's.
Want to see what a Roots blower is capable of? Go to your local Cadillac dealer and test drive an 09-10 CTS-V! If that doesn't make you a believer, than there's NO hope for you!