Trading gold futures today I noticed that e-minis showed a bias compared to the normal COMEX contract. For example the COMEX bid/ask would be 6 at 7, and the e-mini would show 7 at 9. This upward bias seemed pretty consistent and I'm wondering if it couldn't be used as a kind of small vs large hands indicator. I'm sure it's been tried before. Anyone here thought of this, use it or try it before?