Hmmmmmm.

You'd assume it's rounding somewhere. The long PCI without any truncating or rounding is 18.084...so something in the thousandths isn't getting rounded correctly.

My thought is this...and it might be a long shot, but it's a thought nonetheless. That the Advisor is displaying a rounded number and that the calculation is actually to a much further digit. In other words, when your PCI rose to 17.60 the turn prior, it was actually 17.601 or more. Though it would require that you know your current PCI to the further digit to begin with.

I've got to believe it's something with the rounding anyways for it to be 0.001 off like that. My thought is that PCI change isn't actually rounded, just the display is. And like I say that 17.60 Current PCI number was somewhere in the thousandths more. I'll move the rounding in the spreadsheet to show you what I mean.

I know from testing that tech percentages at least go to a much further decimal than the game displays as well, and the pop change formulas vary from in game experience because I don't have the full formulas for tech entered in the spreadsheet... Perhaps it's just that the rounding in the formulas is only for display.