The 2011 Chevrolet Impala is a full-size sedan known for its combination of fuel efficiency and safety features, achieving up to 29 mpg on the highway. It offers advanced technologies like electronic stability control, six standard airbags, and the OnStar system with automatic crash response, along with a 100,000-mile/5-year powertrain warranty. The Impala also includes a spacious trunk and flexible rear seat options for enhanced cargo capability.