I'm not keeping a record of my "mileage" - because it would be fair, as I am "biking" on a stationary bike indoors, and so cover "more" miles than I could walking, am not subject to the vagaries of New England weather, and so figure it ain't fair to compare! But keep walking, Richard! You're not subject to the treacherous conditions of Boston-area sidewalks in winter, so you are far safer!