Curbed and Splitwise, an app that helps divide restaurant tabs and other group expenses, came together recently to create a map that quantifies how much you can save living with roommates across different neighborhoods. In the red and orange areas, like Midtown and Downtown Manhattan, you won't save that much by joining forces with two others in a three-bedroom. In general, as the map shows, you'll save more by living with roommates in Brooklyn than in Manhattan.

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