I guess I'm doing it wrong. I use "Ahead Standard," which usually works out to 10 knots, less in rough seas.
Keep in mind that so far, I've only done patrols with Type IIs. It doesn't have much range until the IID upgrade. But you only get 5 torps anyway, so running out of fuel shouldn't really happen.
Even so, I managed to do it once, by profligate use of flank speed. I ran dry of fuel oil just close enough to home port to make the rest of the trip on the batteries.
Once I've used all torpedoes, I go home at Full or Flank, so that I can get back in the fight as quickly as possible. Of course I turn it down to 1/3 or even Slow in the harbor area, so I won't run into anything.
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Windows 10 Pro (x64)
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