Orcs and XP through the Ages

I have been working on a booklet about humanoids and found some interesting tidbits about XP ratios and humanoids through the editions (and this also touches on treasure). The main simple distillation of what I found can be seen in the ratio of the number of orcs a party must kill/defeat before rising from 0 XP at 1st level to 2nd level.

After almost 40 years, I now understand why I always thought AD&D was more of a grind than B/X, which I think is a major element in my preference for B/X...

Party of four adventurers: Cleric, Fighter, Magic-user, and Thief; XP required to get to 2nd level:

OD&D: 7,200

GH: 7,200
B/X: 7,200
AD&D: 7,254
5E: 1,200

XP Value of One Average Orc (5 hp):

OD&D: 100 xp
GH: 10 xp
B/X: 10 xp
AD&D: 15 xp
5E: 100 xp

Number of Orcs a Party must Kill to rise to 2nd level (not including Treasure XP):

OD&D: 72

GH: 720
B/X: 720
AD&D: 484
5E: 12

Average Treasure per Orc, including Individual & Lair Treasure (except 5E), ASSUMING MAXIMUM COINS in treasure (not counting gems or jewelry) and Orcs per Group:

OD&D: 26 gp (TT D: 8,000 gp/300 orcs)
GH: 26 gp (TT D: 8,000 gp/300 orcs)
B/X: 133 gp (TT D: 8,000 gp/60 orcs)
AD&D: 16 gp (TT C, O & L: 4,860 gp/300 orcs)
5E: N/A

Number of Orcs a Party must Kill to rise to 2nd level (including Treasure XP, except in 5E):

OD&D: 58

GH: 200
B/X: 51
AD&D: 234
5E: 12