Net units closed in 2011: 33
It isn't easy being the Hertz of the increasingly cutthroat fast-burger niche. Burger King recently went public again as its private-equity owner sought to take its chips and go home. Meanwhile, the chain is now half the size of leader McDonald's -- and its per-unit average sales are half as much as well. If that isn't bad enough, upstart better-burger restaurants are sprouting up everywhere, led by Five Guys Burgers & Fries, which opened 182 units last year.
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