Refinery ratio

it's 3 for regular, 4 for the ones in uncolonizable zones. You can tell by hovering over the extractor. There is a tooltip that tells you either 0/3 or 0/4 which is the capacity. Generally putting one refinery in each planet will give you close to 100% coverage.

I forgot to note refinery range is one jump.

If you mouse over an asteroid, it will show "Refinery Quota: x/3", with x being the number of refineries within one jump of that system. 3 is optimal, with diminishing returns after that.

While placing one refinery planet will give your almost complete coverage, planning out your refinery placement is cheaper and gives complete coverage and saves logistic slots on planets.

Also gives you a headache. I'm trying to simplify it for the gent.

Put refineries on planets with lots of phase lanes going to them. Put trade ports everywhere else.

Thanks for the info. It was simpler than I expected. I was bracing myself for some hardcore number crunching.

On a side note, I was trying to earn the Mining Magnate (name?) achievement when I realized that the Advent's refineries don't send out ships. They seem to just magically generate extra resource. The downside of this is that on the statistic screen, you always get 0 income from refinery ships. Took me 4 hours to figure this out.

Can anyone confirm this?

Yeah, the Advent's 'refinery' is really just a bonus to the resource extraction rate in its system, so its not actually generating anything by itself, as the real refineries do.