Optimum speed is around 10 knots. With ISP I set the telegraph to 2/3 for transit and 1/3 for patrolling. If you're short of fuel on your way back set 1/3. ISP has your sub influenced quite a bit by weather and some by crew efficiency. When set to Standard you may not be making more than 11 or 12 knots but you're calling for more and burn at the higher rate. (I want to say standard will give you 16 or 17 knots on flat seas with an efficient crew.)
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