Car-sharing chart: compare and contrast cars and costs

Patrons of car-sharing serverices like Flexcar and Zipcar schedule the time they'll be driving the car, pick it up at a designated spot, and when done drop it off at the closest program station where the next person picks it up.
But how does one know what's the best program for his or her needs? Elsa, owner of the blog the greener side, checked out three services and created a nifty chart, comparing and contrasting each program's costs, usage rate, and cities covered. She also includes links to general car-sharing information, as well.

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