Zipcar is testing pay-per-mile rentals in some US cities

Car-sharing service Zipcar has started offering a new pay-per-mile plan in some US cities, a departure from the per-hour system that the company is known for. A Zipcar spokesperson tells The Verge that it is "testing this new pricing in select cities throughout the US," which suggests that it's still a pilot program and won't necessarily roll out widely.
Technically, the pilot is a combination of pay-per-mile and pay-per-hour: in Chicago, for instance, where the new plan is being offered, a flee