bat, Your link does indicate that the setting can be changed for an Outback. The Prius mpg error has been discussed repeatedly since the gen 3 came out over 7 years ago.There is no dealer or consumer setting for a Prius. Changing the setting on a Prius therefore would involve hacking the code. That is what mikefocke is referring to when he says "Doing so would void any warranty." He is not talking about the Outback.