Interesting stuff. Thanks for the tests.

Only problem is I don't think you can just click end turn and compare the results from the previous turn.

You need to save, build, end turn.

Reload, don't build, end turn.

Compare those results.

There's natural variance in all the figures. You'll confuse those figures with the effects of the building unless you use the method I describe. (actually, even the method i describe may not work, since the buildings you build seem to affect the "seed" -- e.g. sometimes I build a building and the outcomes of auto battles are different than when I didn't)