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General Motors’ OnStar subscribers can now rent out their idle vehicles through the RelayRides marketplace, leveraging OnStar connectivity already active in their vehicles to potentially earn hundreds of dollars a month to offset the cost of owning a vehicle. RelayRides’ renters can unlock reserved OnStar-enabled cars simply by using their mobile phones. RelayRides is the first third-party developer to integrate with GM OnStar’s proprietary application program interface (API) that will be available to other developers later this summer. (OnStar Photo)