More Chevrolet Impala standard features are the big news for 2009, including dual-zone climate control, front seat side airbags, antilock disc brakes and traction control. The Chevy Impala is a 6-passenger family sedan that is known for comfort, safety, fuel efficiency and smooth ride. The Impala LS and LT come with a 3.5L V6 engine that produces 211 hp and 214 lb-ft of torque. Standard on the 2LT and LTZ is a 3.9L V6 with 233 hp and 240 lb-ft of torque. The Impala SS has a 5.3L V8 generating an impressive 303 hp and 323 lb-ft of torque. The 3.9 V6 and 5.3 V8 have Active Fuel Management technology to deactivate half of the cylinders when cruising to save fuel. All models have front-wheel drive and a 4-speed automatic transmission. Fuel mileage estimates for the V6 3.5L is 19 mpg city/29 mpg hwy and 23 mpg combined, while the 3.9L is only 1 mpg worse. The SS gets 16 city/24 hwy and 19 combined.