Units without maintenance cost
In my current game, under Economic Overview, it's mentioned that I "own 3 units that do not require maintenance."
I'm using the Communitas AI&Tools and Interface mods. Not sure is they made the info available or if it's in vanilla as well.
Factors:
- Built Pyramids (2 free workers)
- Policy: Liberty -> Citizenship (1 worker 'appears')
- Liberated 1 worker from barbarians and did not return to Denmark
Total number of suspects: 4
I do not have the Oligarchy policy from the Tradition tree, so it's not from units garrisoned in cities that cost no maintenance.
Which of these (or the other) units are usually maintenance-free? And is there any way to find out which ones walking around, say, 1 of 6 workers, is the cheap one? ;)
I believe I have found the source of your three free units.
The Honor Tree's Military Caste: 3 units cost no maintenance (in addition to garrison bonuses).
After some digging through Communitas's patch-notes documentation I found this page which contained the information. This is the only maintenance-free changes I could manage to find in all of the documentation that I searched on the Communitas site.
I don't use this Communitas mod (i don't use any) but i have the same message. So i don't think this answer is right. After my own search, i found that maintenance free units are: Cargo Ships, Caravans, and Guided Missiles.