My Jeep is an automatic but my CTS is 6-speed. It has somewhat similar final drive gearing to the Jeep meaning at 70mph in 6th gear it is around 2000rpm. Driving around town I'm mostly in 5th. At or above 40mph I'll go to 6th. This car probably has more torque and definitely less weight so it is reasonable to drive in 6th at speeds above 40mph, but you have to downshift if you want more response.