Bundled Fee: 2.4 per contract or 4.8 Roundtrip
Unbundled fee per contract (for up to 300 contracts per month):
IB execution fee: 0.90
IB clearing fee: 0.30
IB carrying fee: 0.10
CME exchange fee: 1.14
Regulatory fee: 0.02
Total unbundled commission: 2.46 per contract or 4.92 for a round turn.
Now for the volume you do between 300-1000 contracts the IB execution fee drops to 0.70 per contract. So your cost would be 2.26 per contract or 4.52 for a round turn.
So with unbundled you actually pay 0.06 more for the first 300 trades compared to bundled commisions then your cost drops 0.14 per commisions for anything over 300.
So unbundled is really only worth it if you trade over 500 contracts a month. Anything over 1000 contracts and you get another 0.55 savings per contract.