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You are correct. Load is load. Even an imbalanced load does work so its not an efficiency problem. The diagram is a simplified version of an alternator. There will be more pole groups than is represented so the rotation distance between peaks of magnetic flux will be a lot closer together...

I fell like I should probably let you off the hook at this point. I was asking those questions to make the point that the return path doesn't matter in regards to fuel efficiency or energy waste. The engine won't be loaded any differently whether a 5kw load is split equally between L1 and L2...

Doesn't all energy that leaves the head have to return to it?

Why is energy on the neutral not performing work?

Could you expand on how an imbalanced load affects fuel efficiency?