Exactly how adjacency bonuses are calculated

[Gumsk]

I kept hearing bad information put forth about how to calculate adjacency bonuses, so I sat down today to figure out exactly how they are calculated:

Formula
Adjacency Bonus = (Base stat) * (Module Bonus Amount) * (Bonus Multiplier) / 100.

Bonus Multipliers

• Two upgrades of the same type treat their bonus as the sum of their base bonuses and use the "BonusSameTypeElementsAdd" or "BonusSameTypeElementsMultiply" bonus multiplier.
  
• Two upgrades of different types use the highest upgrade value between the two and use the "BonusChildTypeElementsAdd" or "BonusChildTypeElementsMultiply" bonus multiplier.
  
• An upgrade that adds a fixed number to a stat uses the "BonusSameTypeElementsAdd" or "BonusChildTypeElementsAdd" bonus multiplier.
  
• An upgrade that adds a percentage to a stat uses the "BonusSameTypeElementsMultiply" or "BonusChildTypeElementsMultiply" bonus multiplier.

• BonusSameTypeElementsAdd = 0.06
  
• BonusSameTypeElementsMultiply = 0.04
  
• BonusChildTypeElementsAdd = 0.05
  
• BonusChildTypeElementsMultiply = 0.03

Examples

• A ship with an 80 base hyperdrive stat and two +250ly S-class modules that touch each other would get the following adjacency bonus: 80 * 500 * 0.06 / 100 = +24 ly
  
• A ship with an 80 base hyperdrive stat and one +250ly S-class module next to the hyperdrive (+100 bonus) would get the following adjacency bonus: 80 * 250 * 0.05 / 100 = +10 ly
  
• A ship with an Indium Drive (no bonus) next to the hyperdrive (+100 bonus) would get the following adjacency bonus: 80 * 100 * 0.05 / 100 = +4 ly

[BigKahuna]

I've wondered about the details of the bonus for quite a while. Super valuable post, thank you!