The Chevrolet Impala has been around for many years, with the first generation sprouting as a 1958 model. After taking a couple of breaks here and there, Chevrolet's full-size car is in its ninth generation and it's beginning to show its age. Nine generations breeds a variety of engine options, but the current Impala model is powered by a choice of two engines: a 3.5L V6 engine producing 211hp and 214 lb-ft of torque and a 3.9L V6 engine delivering 224hp and 240 lb-ft of torque. Both engines are mated to a four-speed automatic transmission. The mid-level trim comes with Active Fuel Management which shuts off half of the engine's cylinders in order to improve fuel efficiency. The Impala can now get 14-18mph city and 21-29mpg highway.