What do you mean more efficient? Do you mean fuel efficient, or efficient in terms of speed from one place to another?
Fuel efficiency and speed are, typically, based on several series of small refinements and improvements. Disregarding cost, if you look at the most recent and most expensive shipping boats and look at how they’re different from the tugs of old, there are your improvements. As for future improvements, “it depends” is the best I can do.
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