DO NOT LIKE Coast function!!! Firstly, out of the corner of your eye, you notice the revs drop like a stone on lift off, then you look down and simultaneously think "WTF", then out of your peripheral vision you notice that you are gaining rapidly on the car in front, which has good old fashioned engine braking! Then you hit the brakes! So, I've saved a few millilitres of fuel but vapourised brake material instead - which is cheaper? I have no idea!Still glad I went for a petrol S with PSE! Happy Christmas to me! Not long now!
According to the Porsche App "Good to Know", Coasting or Gliding is disabled when Stop/Start is disabled.