An example from a patrol I finished today using long range type 9C Uboat attacking coastal waters of America in February-March 1942, first 2 were British ships sunk enroute to America and last one was a British ship sunk coming back home. All the rest were American ships and a good variety of historical class ships in the patrol with no duplicates (though duplicates are still seen sometimes like in convoys). Got back with only one torpedo remaining and 25% fuel left after almost 2 months on patrol (of the 21 torpedoes fired - 15 hit their mark, experienced 4 torpedo failures and 2 missed shots and all were either lone merchants or traveling in pairs)
https://1drv.ms/u/s!Apf4S8iaE41MgYgq...i-g4A?e=igxE9H
https://1drv.ms/u/s!Apf4S8iaE41MgYgo...5L9yw?e=DLFj6w