ps. It doesn't matter what tank size you have, 0 psi is 0 psi. If you have 3000 psi and you are dropping 100 psi per minute, then you will be at 0 in 30 minutes.
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You also need to know the average depth over the start-to-finish, to get the gas consumption back to the "surface." Otherwise, it is not an SAC, just an AC.Well I think if you average over all your multiple data samples you should arrive at the same answer as if you just go start to end. So if you're looking at the number on stats tab, that should be it. The momentary RMV number on the pop-up would be something else, based on the samples around that point.
Unless I'm misunderstanding again, without looking at subsurface code, and all that.
You also need to know the average depth over the start-to-finish, to get the gas consumption back to the "surface."