Cannot possibly trade well, especially intraday, without knowing exactly what the PREM/Disc is to Fair Value. I give all my traders a spreadsheet that calculates this value, second by second.
When the futures are trading 2+ ticks over FV, that is an immediate indication of market movement in the underlying stocks, and vicer versa when trading at a 2+ discount below FV. When combined with pivots, and depth of book, is a must for trading IMO. And, after the market closes, and the E's are still trading, we can see exactly what the sentiment is.
And, we can't do opening only order calculations without these numbers. Yes, they are a bit different depending on the traders cash status...whether they are trying to beat the street with their long cash, or if they have to borrow and pay interest to engage in long short strategies. This interest rate differential is all the difference you should see.
Don