When I was in charge of a IXD2, I always asked my crew, "Ok, ahead standard on the way there or back?" Otherwise I just went ahead one-third.
BTW: with vonhelsching's range correction for the IXD2, I tested ranges between the XXI and IXD2 and found that going ahead standard with MAN on a IXD2 is around 21000Km(17kts) while going ahead standard with snorkel underwater with the XXI is about 25000Km(16kts). XXI has better range.
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