I can not help with the route, however, take your time. Much more enjoyable. I like to get up early, have a coffee, and head out. Grab breakfast on the road. Then I prefer to stop early in the day, make my camp etc. That way i get the choicer accomodations, and can be ready for Happy hour. That also allows for some exploring locally, and gets rid of the dreaded "where we gonna stay tonight" syndrome. Makes for a much more relaxed trip. If you are camping, remember, "It's a backpacking trip, just on 2 wheels". That makes limitting the junk you carry easier.
Hope this helps.