On www.dfuser.com there is an excel spreadsheet that can be used to track just about anything you might want to track regarding mileage. Once you hit this website - rest your mouse on "Documentation" and then click on "Documentation and Install Guides" - towards the bottom under "Other Stuff" there is a link to the Excel file I am talking about. I am going to Savannah from Atlanta today and plan to use this for a while to see what I can see (sounds like the verse for a song huh?)