The new engines are more efficient both in fuel consumption and in whatever emissions they discharge into the air. Much quieter, too. I'd guess the new engines require a lot less maintenance and don't have to be rebuilt so often. The new engines have transmissions, so you can shift gears without having to stop and restart the engines when docking.
I do miss the rumble of the old engines--we could hear the Mount coming from behind the island long before we could see her.
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