500 miles is a point at which I'd VERY seriously consider getting rid of the Prius. It would still be less convenient than the stinker. I can park the Prius at a heliport and leave it there for two weeks while I am hiking at a wilderness lodge. With a 500-mile EV I'd have to arrange for a place to plug it in, and then get a ride to and from the heliport. But it would sure be worth considering. The other down side it that it would probably cost $100,000 and I'd really only need it for my once-a-year hiking trip. Unless I traded in the Prius and the Roadster.