I think in RFB, 8 to knots is the cruise speed you have to use.
If you go into the individual boat sim files, you adjust the range and speed to whatever you like.
As an example, one of the mega mods has the Gato surface range in sim file as:
miles=14138
speed=15.19 knots.
That way you can run across the Pacific at better than harbor speed, but you can adjust your speed on patrol while in the combat zone to get better fuel economy.
Just watch how much diesel is used travelling, and if you are out from Pearl, and it looks like you may run short, you can always stop in at Midway and top up the tanks before the trip home.
You can do the same if you prefer leaving out of Pearl too. Stop at Midway (like the boats did) before heading to the swimming hole.
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A legislative act contrary to the Constitution is not law.
-John Marshall Chief Justice of the Supreme Court
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