About 2015 Chevrolet Impala Limited The 2015 Chevrolet Impala builds on the attributes from its major redesign last year. A pair of new features enhances everyday driving: fuel-saving stop/start technology on the 2.5L engine and new OnStar with 4G LTE connectivity and standard built-in Wi-Fi hotspot. Stop/start technology shuts down the engine in certain driving conditions to reduce fuel consumption -- boosting Impala's city mileage 5 percent, to an EPA-estimated 22 mpg. OnStar with 4G LTE and standard built-in Wi-Fi hotspot provides a mobile hub for drivers and passengers to stay connected. The hotspot is on whenever the car is on. The 2015 Impala is also offered in an all-new bi-fuel model, making it the industry's only manufacturer-produced full-size sedan in North America that can run on both compressed natural gas (CNG) and gasoline. The 2015 Impala's design is one that honors the cues that helped distinguish the classic nameplate for decades. Sculpted coves in the body sides add to the Impala's design drama, with a sweeping signature cue in the rear fenders that acknowledges classic Impala designs. Impala's next-generation MyLink provides easy, intuitive operation of basic functions, yet it is also highly customizable and capable of linking up to 10 devices such as smartphones, SD cards and MP3 players, giving users more ways of staying connected. The 2.5L is rated at 196 horsepower and 186 lb-ft of torque. Revised transmission shift points and quicker shifts also enhance the feeling of performance -- while delivering greater refinement. Output for the 3.6L V-6 is rated at 305 horsepower and 264 lb-ft of torque. That is the highest horsepower output in the segment from a naturally aspirated V-6 engine. Each engine is matched with a six-speed automatic transmission.