A remaining energy supply warning system provides different low fuel level reminders and warnings according to a driving area determined by a navigation apparatus. When within a life domain of the driver, low fuel level reminders and warnings may be set at lower threshold amounts since the driver is well-acquainted with the area. Therefore, the driver of the vehicle will not be bothered by low fuel reminders and warnings when the amount of fuel remaining is still relatively high considering the driver's knowledge of the area.