Pizza Hut may have more U.S. units but sister chain Taco Bell brings in about two-thirds of Yum! Brands’ U.S. profits and its stores book higher average sales than Pizza Hut or KFC. Taco Bell’s performance has Yum! planning to expand the chain from 5,000 U.S. restaurants to 8,000 in the coming years. Read the Bloomberg Businessweek story here