I have a non-limited non-NAV base HiHy. I have seen pictures and read where some non-limited HiHy are able to display the average MPG ( not the current MPG) on the MFD ( Multi functional Display) and others can't, such as mine. I have checked with my local service manager and he doesn't have a clue how to enable this feature. Is there anyone who has seen or had this feature added and how was it done?