Well mate i'll tell you what - change the speed to 9 knots and then see what the range says. As i understand it, 9 is actually the best speed for fuel consumption.
Also, bear in mind that as you start using your IXB, you'll be able to start making use of the milkcows which will become available.
As for the speed dropping briefly, it can happen during turns, any waves you go over (tho you say its dead calm), and it could possibly even be a faulty knotmeter if you have SH3Commander and malfunctions/sabotage turned on.
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