As you say on the manual it does the start stop.
On the auto it apparently changes the lock up point of torque convertor and when the auto box will change gear.
Like you the difference i notice seems to be lack of power so you floor it more and economy drops
On the auto it apparently changes the lock up point of torque convertor and when the auto box will change gear.
Like you the difference i notice seems to be lack of power so you floor it more and economy drops