Read a good post about a woman living in her Prius. She has found some creative ways to turn it into a single person RV of sorts.
Great idea for someone traveling alone and needs to travel many miles for minimal costs. I especially like the part where the Prius can start and stop the engine as needed for heating and A/C when parked.
http://www.cheaprvliving.com/other-c.../living-prius/