Oh it's not that difficult. It's not something you have to keep tabs on constantly. I just look at my total tonnage sunk and divide by how many torps I've fired. If you've been in the same boat the whole time, say a Type VIIB, then you just multiply your patrols by 14 to get total torps fired. That is assuming that you always launch all your torpedoes, but that's almost always the case anyway. Sure there are some things that throw off your efficiency, like using the deck/aa gun, or ramming or something, but as a quick little thing to calculate it's a pretty cool thing to know. It gives you something else to be happy about after a patrol, looking at how well you used your torpedoes. It also is a reminder not to be wasteful, as a couple hasty shots will really screw up your efficiency (I tend to get hasty and mess up shots a lot.)
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