Yes, commission was something I missed in my post. For all the above mentioned index futures, the commission at TS is $5.60 per RT and contract, a bit less at IB.
Calculated in percent of the contract value:
ES, ER2, YM: 5.60 / 50000 =0.011% of contract value
NQ = 5.60 / 27000 = 0.021% of...