To be honest, haven't tested it so far as I have this bad habbit of keeping hold of the remote unit and to adjust the settings as per my liking.
Econavi system employes a set of sensors that monitors sunlight detection, activity detection, absence detection, area search etc., and continuously adjust the temperature, fan speed, louver movement etc., to reduce the amount of energy wastage. This is actually different from the auto setting of the AC which is programmed to work on a set pattern without involving human activity inside the room.
In short, if you simply want to keep the room cool then it doesn't matter if the AC is equipped with such a gadgetry, however, please ensure to get the latest model AC.