User blog comment:Muuuxy/Personal calculations/@comment-17677153-20131004021152

Basically, prepare to be disappointed by your recipe assumptions. They're taken from the Japanese wikis, which take their samples from voluntary submissions.

If you do happen to land both submarines while trying for Shimakaze, 2-3 is a great place to make fuel. Also, grab all those extra expedition fleet reward quests ASAP!