The Fits are only available for hourly use, at least in Chicago, and Zipcar sees the new option as a solution for all the times "you just need to make a short trip." Of course, if that drive is more than about 10 miles, you'll be better off with the regularly-priced vehicles. If your destination is within a couple miles though, this could save you some coin while Zipcar is looking to keep pace with ride-sharing and other car-sharing options. Earlier this year, the company announced it would allow customers to keep a vehicle as long as they wanted while changing drop-off locations and destinations as needed. That service will be available in Michigan by December, a direct answer to GM's Maven car-sharing initiative.