The 2012 Chevrolet Impala is a reliable, full-size family sedan notable for receiving a significant powertrain upgrade: a 300-horsepower 3.6-liter V6 engine and a 6-speed automatic transmission. Today, these vehicles generally trade in the $4,000 to $8,000 range, depending on mileage and condition. Key Specifications & Features Engine: 3.6L V6 Flex Fuel with 300 hp and 262 lb-ft of torque Fuel Economy: ~18 MPG City / 30 MPG Highway Seating: 5 to 6 passengers (available front bench seat on LS/LT)Trims: Available in LS, LT, and LTZ Cargo Capacity: 18.6 cubic feet in the trunk.