That's exceptional fuel economy for that car, typical looks like 25-35 MPG. If you are more skilled than average (I'm guessing so), don't have too many short trips, and live somewhere relatively flat no doubt it's doable. Edit: while I was looking I checked out the Prius and RAV4 and it turns out median reported MPG is around 49 and 39 so maybe my intuition is tainted by living in a hillier than average area.