But...
The more I've thought about it, the less I have to agree that it's been happening all along. After I made my original post and response, I asked some of my friends and family who also happen to boat on Winnipesaukee about what I've seen. They've noticed it, too.
If idling along on two engines can bring a GFB above headway speed, then wouldn't it be easier to only put one engine in gear and leave the other in neutral? I can see that a cold start might use more fuel than leaving an engine idling, but a warm start uses very little fuel and will consume less fuel than an idling engine.
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