9 knots is the best speed in an un-modded game. I hope you have a fleetboat and not a S-class or PORPOISE.
A TAMBOR, GAR, GATO, etc have a much longer range.
Running on batteries doesn't save fuel either because it costs fuel to charge the batteries.
If you are trying to be historical, you can run on the surface until you reach Empire waters and then patrol 9 knots surfaced at night and submerged at 2 knots during daylight hours.
Happy Hunting!
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" Bless those who serve beneath the deep,
Through lonely hours their vigil keep.
May peace their mission ever be,
Protect each one we ask of thee.
Bless those at home who wait and pray,
For their return by night and day."
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