Certainly these two fine gents don't think anybody actually buys their little song and dance, do they?
In any time of the war, using TMO plus RSRD, which further restricts spawn rates, I have a hard time saving enough torpedoes to do anything with after I reach my assigned patrol area. I'm sure I'm far from unique.
My present cruise, December 1941, sugar-boat, I've used all but four torpedoes and just reached my patrol area.