Gaps are calculated from highs to lows or from lows to highs between days. The closing and opening prices have no bearing in my view.
I'll usually take a trade back to the 4:15 shut as a gap fill in cases like this where the market rallied a bit after the cash close, so anywhere between 85.50 - 89 would be close enough for gov't work. 93 is just wantonly ignoring the rest of the world. It's like saying the sun was so dark last night I couldn't wait for the moon rise this morning. At any rate, took a 5 point hit on that first long, and trying it again now here at 91. What a week for me ... as in not very good. My total take right now is about my average day lol
You can keep saying this is so, but the entire rest of the world does not measure gaps this way. Only you, boss, only you.
Common sense tells me that I am looking at it correctly for what I do. Gaps are gaps in price printings. If you went the other way, you would be keeping track of "gaps" all over the place and that just has no basis in any kind of reality.
Notice how most days, there is a gap under Vol and Pek's definition. That is way too much insignificant information to keep track of. If someone is wanting to look at gaps the way Vol and Peks do, that is certainly their prerogative. It doesn't work or make any sense for me. In my view, gap analysis is insignificant "junk" analysis anyway.