The fuel economy of a 2011 Chevy Camaro varies significantly depending on the engine and transmission. There wasn't a single engine option. You'll need to specify the engine (e.g., 3.6L V6, 6.2L V8) and transmission (automatic or manual) to get an accurate MPG figure.
To find the exact MPG for a specific 2011 Chevy Camaro configuration, I recommend checking the EPA's fueleconomy.gov website or consulting the owner's manual for that particular vehicle.