Talk:Fusion/@comment-219.92.190.110-20131222145030/@comment-4830769-20131227065835

Energy returned by upgraded mods has a diminishing return.

so it is more efficient to fuse blank copies of a duplicate mod, rather than already leveled versions.

combining two R7 Vitalities will be a huge waste of your time upgrading the second one. it'll give you ~5% of the required Energy, at best.