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Originally Posted by mattW
However that experiment didn't take into account the alternator load which I think is the most important factor for this to be worth while.
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How do you figure? I'm pretty sure the car's alternator was connected during the test. Maybe I'm misunderstanding your point.
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Personally, I have found that I get worse FE when turning off the engine whenever I can compared to using engine-breaking in high gear so the fuel injectors shut out
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But that doesn't make sense. In both cases (fuel cut-off state in top gear vs. engine-off in neutral) the engine is using no fuel. Yet you'll travel a shorter distance when engine braking in top gear than you will in neutral with the engine off. Whichever method takes you farthest in either case will yield maximum fuel economy overall.