I just follow the slower is more efficient philosophy. I am sure someone here has some hard numbers. When heading back to port (all torpedo's spent), I normally plot the course, then ask the NO for distance to end of plotted course and maximum distance at current speed. then adjust my speed to get me there the quickest while not running out of fuel.
I did actually have one mission where I was running so low on fuel that I had to run submerged at ahead slow (best use of batteries) till the batteries were drained, surface and run at ahead slow (order the CE not to recharge the batteries) and barely made it.
DU
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