Do you also understand that when you dive you can go to all stop...not drain your batteries...and therefore not waste fuel recharging when you surface and resume course ? Do you understand that battery recharge needs to be turned off eveytime you surface? Do you understand that repaired damaged batteries will not always recharge 100% and continue to recharge,thus waste fuel, until you turn off recharge?
If you have trouble making it from Japan to Midway with a 60% fuel range remaining then there is something definitely wrong with your ship handling. I do it rountinely at Ahead Full...even Flank at times ...forget 9 knots...

..I save that for patrols when I'm down to 20-30% and need to get back to Midway. Sometimes I have to head south to refuel before I RTB via Midway or Johnson's Atoll.
Also this....
Quote:
three full trips accross the pacific takes up a very large chunk of my night.
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LOL...3 trips across takes up a huge chunk of my week...if you are trying to play a full patrol in a single session then...no wonder....