We live in Florida and made a 9500 mile trip this past from Florida to So. Cal. Then up the coast to Seattle, took a cruise & land tour to Alaska, then returned back through Glacier NP, SD, and followed the Lewis and Clark trail back to Omaha. I pull a 25 ft.FW and get 10.5 MPG. We drove from 9:00 to about 3:00 on the days we moved. Some days less as we stopped and stayed longer at a scenic overview. It was a no brainer as to comparing $$$'s. I saved also by using my Golden Age pass and Passport America membership. Since we tend to use the showers and restrooms in the campgrounds we have extra storage in the shower for clothes. There are many small county and city museums in the towns you will be driving through so don't pass them by. They can also point you to city parks where there are RV camp sites.
As some one said earlier, Motel managers get upset when you build a fire in the lobby. It is also nice to have breakfast setting out side watching nature. Many small parks are nature preserves and the wild life are used to humans and will often pass very close to you as you set outside. Take your time and don't pass by a sight. You may not pass that way again.
