From the factory all cars are preset with the EPA efficiency numbers. As you drive they learn and adapt. Each manufacturer uses a different rolling efficiency period to update the GOM range display (Guess-O-Meter). Chevy uses 50 miles or 100 KM (depending on the country). I don't know what Honda uses but I suspect it's similar - too long and it's useless to handle changing conditions and too short and it's all over the place.