Puzzling

After I posted the update on my Walk to Rivendell mileage I went over to the Eowyn Challenge page to update my shields and to get the distances for The Hobbit. I decided to go ahead and do the Grey Havens leg of LOTR after I get back to Bag End. But when I went to the section for The Hobbit, I learned that they have the Bag End to Rivendell and the Rivendell to the Lonely Mountain distances posted, but nothing for the return to Bag End! Somehow I don't think Bilbo retraced his exact steps. Wonder what my chances are of hunting down a copy of the Fonstad book.