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5% is a lot. Hell, current advances in aircraft tech (mainly winglets) are for 1 or 2%.
Let’s say the ship uses 1000 tons of fuel for a journey. It’s about $200 per ton for bunker fuel, so that works out to about a savings of $10000 per trip. If they make 40 trips per year, say a week long trip with a day on either end (i used 1000 tons because I found a source that listed about 150-200 tons per day), that works out to $400000 per year, per ship.
That’s not insignificant.