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.
- 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? ;)