Sit-down restaurants like TGI Fridays and Red Robin (RRGB) are losing their hold on American diners as reflected in the latest American Customer Satisfaction Index, which tracked the lowest score for the category in more than 10 years. For the first time, fast-food restaurants are actually scoring higher in consumer satisfaction than their higher-end rivals, the report said.  The fast-food industry is innovating through chains such as Panera (PNRA), which offer a bridge between traditional burger restaurants and more expensive sit-down chains. At the same time, consumers are increasingly skipping the mall, where many of the big American full-service restaurants have key locations.  Delivering a satisfying experience may also be more challenging for table-service restaurants, given that customers will want to feel the meal is worth the additional cost.  “The quality of quick-service or limited-service options have grown so much over the years. When people think fast food, it’s not just McDonald’s or Wendy’s any more,” said ACSI director David VanAmburg. “We’re seeing prices rise in the full-service side of the business, and that’s a...