Do you notice any difference in gas mileage since switching to smart mode? I’ve been going back and forth from comfort and Eco. Started in smart, but prefer comfort or Eco since most of my driving is city.Mine stays in Smart mode now. Most of the time I use the adaptive cruise control which automatically select that mode while engaged. When I first got my Limited I kept it in ECO mode but since making the switch I have not noticed any difference in performance.