Not sure about the new 2.4
Not sure about the new 2.4 turbo, but I've had two turbos (older one 2.5L; the more recent a 2.0L) and both "recommend" premium but grades of at least 87 octane will work. Caveat is that with lower octane, the power/torque is less plus I've found fuel economy drops with regular. I speak from experience. Premium is worth it if you want power with reasonable fuel economy. #Pay4Power.