I've been collecting numbers about the heat efficiency of mining beams. With my ship alone, figuring out 1 beam, 2 beam, and 3 beam general heat rates, it gets much more efficient as the more beams there are. However, when mining with someone else, the rates doubled, due to two people mining? Does beam efficiency only count across one ship? Didn't it promise that multiple people mining together would increase efficiency?

Actually, scratch all I've said. You have to be grouped.

Heh, yes. You have to be grouped to gain the efficiency bonus.