Net units closed in 2011: 334
The perennial number-two in the toasted-subs category, Quiznos' history of poor relations with franchisees -- who have repeatedly sued the corporate parent -- is just one factor that's challenged this chain's growth. The other, of course, is the growing dominance of archrival Subway, which gained 872 units last year. It's now a wide gap between the two in terms of units -- Subway topped 24,700 (the most of any fast-food chain by far) while Quiznos shrank to 2,503.
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