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I've often wondered why ships must go full speed and why anyone would want ships to go faster. It is literally exponential the amount of fuel it takes to go the next highest speed and needless to say a direct cost on the price to ship.
A massive ship can see massive savings all the way down to about 4 knots because of the size and shape. Might be worth using 1/8 the fuel? Especially when you are talking many tens of thousands of gallons.
If it isn't perishable, slower is the way to go.
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