Just purchased a new 2013 Jeep Compass Latitude . A 2.4 L automatic transmission 4x4 . Couple of questions . The button to the right of the first seat heater button with a pic of a car and some tire tracks , I'am assuming this button controls the AWD ? If depressed I see a off light on the instrument panel . Would it be better to run with this system off during the summer months to save on gas ? Also I tried the 4WD T-handle and it engaged perfectly , does the AWD button need to be on or off to engage the 4WD .? Also will the 4WD lock and engage completely , that is without the automatic system switching it off ? Thanks for the answers .