I've wondered about auto share. It seems like a good idea. I'm kind of addicted to the convenience of just jumping in the car and going. Even though I only put on about 10,000 km a year, I'm not sure auto share would work for me. I believe with auto share, you have to book in advance. I think you are also limited to 24 hour rentals, so you can't take off for the weekend. But it sounds to me like it would work well for some people, especially if you don't mind pre-booking. It sounds very economical.