Also keep in mind that fuel range is not a problem in the game. As long as you keep your speed to 9 knots unless pursuing or maneuvering for position (and there is plenty of extra fuel for lots of that), stay on the surface every second you can so as not to deplete your batteries (recharging batteries takes the same amount of fuel per hour as running wide open), you have PLENTY of fuel to complete your missions, plus accept three or four other assignments before you come back in to port to refuel.
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