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1. Wiki Land expense is incorrect:

Current formulas:
Land expenses < 1500 is (7 / 1500) * (Land^2) + (3 * Land) <<------------------------ INCORRECT
Land expenses > 1500 : 10 * Land <<------------------------------------------------------ CORRECT

Example:
Land: 100

Land < 1500 then -> (7 / 1500) * (Land^2) + (3 * Land)
(100) < 1500 then -> (7 / 1500) * (100^2) + (3 * 100) = 300

If you start a new country right now, the land expenses is $347.
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2. PCI should be 14.66

22.5 * (1 - Taxrate) * (1 + ((Networth/Land)/18000)) * (1 + (2 * (Ent/Land))) * BusTech * GvtPCIBonus
22.5 * (1 - 0.35) * (1 + ((4717/100)/18000)) * (1 + (2 * (0/100)) * .1 * 1 = 14.66

Wiki shows 90000 but 90000 doesn't work with any results that I've tried. After SoD pointed out to me it's 18000 it works; but, just not with the beginning value.

However, if you start a new country, it lists $20.00 (My guess is that this the programmer set PCI = $20.00 instead of to the formula)

If you run about 20 turns, the correct PCI shows. And the formula works.

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3. I'll try out that military upkeep formula. The one you have listed differs from Wiki's.