Hello,
The travel speed bonus of leaders seems not to be used for the ETA calculation, while travelling between systems.
When I want to go to the system next to my fleet (not the one it is on), the ETA is 2 turns.
When I go to the system, the fleet instantly reaches the destination (as if the ETA was 1 turn).
I did some test, and here are my deductions:
I have 2 travel-speed bonus leaders in the fleet (10% and 15%). If I send the 10% ship alone, it takes 2 turns. If I send the ship with +15% alone (or with the whole fleet, doesn't matter), it takes 1 turn but displays a 2 turns ETA.
Here is a save-file link:
https://drive.google.com/drive/folders/1ejTg5eOLSiCcniLnJLvBi4HukdlyXxz8?usp=sharing
To reproduce, use the fleet at the bottom on my empire, in Wolf system, and go to the silicoid one (Tahon). Beware, there are 2 fleets on the node, one battleship with no move left, and the whole fleet is behind ;)
This is the same save-file than for the building-list issue.