I just follow the uboat commanders handbook which states, the default patrol speed is Slow. Those other speeds are just for certain situations that may arise. It works. The most important thing you can do to keep your range high is NOT upgrade your diesels. The upgrade makes for unrealistic speeds anyway. Try it any way you like. My IXB always makes it back from Capetown, without refueling. Unless I sunk. Don't like those Capetown patrols. IXCs and IXD2s are better suited to that area. Long long ride.
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