[Ulzgoroth]

In terms of basic energy yield, I'm fairly sure anti-Lithium shouldn't have any more than anti-hydrogen per unit mass. It's possible that more of that energy can be used (the particle physics there is way outside my knowledge).

It would probably take less volume and containment apparatus to store, but Spaceships ignores both of those things.

I've also got nothing on why it's characterized as 6x delta-V, which ought to require 36x as much energy.