From Chevrolet press: The Chevrolet Impala family sedan continues to combine fuel efficiency and fuel options with roominess and popular standard features. The standard 3.5L V-6 is EPA-rated at 29 mpg on the highway, fuel economy that matches or beats many much-smaller cars. Both the 3.5L and optional 3.9L engines offer E85 FlexFuel capability. Impala is offered in LS, LT and LTZ retail models.
For the 2011 model year, the 3.5L V-6 that is standard on LS and LT models is FlexFuel-capable, able to operate on gasoline, E85 bioethanol or a combination of the two. E85 comprises 85 percent bioethanol, a renewable, domestically produced fuel that produces fewer greenhouse gases in the combustion process, and 15 percent gasoline. The 3.5L V-6 delivers 211 horsepower (157 kW)* and 216 lb.-ft. (293 Nm)* of torque.
The Impala LS, LT and LTZ models have varied exterior trim cues that identify each model including unique 16-, 17- and 18-inch wheel designs. For 2011, body-color bodyside moldings are standard on all models except Police. A rear spoiler is standard on the LTZ model and included in the available LT models’ Luxury Package.