How does my 'average mileage' meter work? When I reset it, it starts averaging right away, so the first few miles have a big impact on the value. But after a hundred miles, each mile (including those first few) has a tiny impact (1/100th), right? If my driving habits change, these changes will hardly be noticeable. After thousands of miles, virtually nothing I do will affect it. Or is this wrong? Does it weight them differently? Does it start "invalidating" data after a certain point? What point?