[johnrobholmes]

Efficiency and amp draw are not tied together directly. Amp draw creates heat with resistance, but higher wind (higher voltage) motors also have more resistance to go along with the reduced amp draw. So, without dyno graphs and specs of a specific motor the ideal voltage and KV cannot be determined for a particular situation.

Of course buying more batteries is an inconvenience. So is buying a new motor and ESC. I would prefer a wind that was great on 6s and outrageous on 8s for battery amp draw reasons. The MMM is a 6s controller so a 4s mild, 6s wild motor just makes sense for the first release.