There is one adult person I know of that doesn't own a car in our rural community. He bikes everwhere he goes. He says that he doesn't mind biking the ~25 miles to the nearest city and appears to be fit and trim.
I've boasted my 65MPG trips to him but he's quick to show me up, as he has spent zero dollars for either gas or insurance for several years.
He also appears to be an under-the-bridge dweller, but I didn't ask.
