EDIT: I forgot to mention. You'll recharge batteries fastest at a dead-stop, but it isn't economical to do that during a normal sea patrol. Infact, you should avoid dead-stops if at all possible unless you're waiting for a convoy. That's why I said travel at Ahead 1/3 while recharging on normal patrols. Ahead 2/3 gives good fuel economy when not recharging batteries, plus it's less time constraining when traveling long distances. Any faster and your range starts to decrease. Any slower, and you'll waste more time getting there. I did a test once to see how far I could go at all speed settings. Here's what I came up with:
(These are all approximate)
Ahead 1/3: 15,000nm or 150nm for 1% of Fuel
Ahead 2/3: 11,000nm or 110nm for 1% of Fuel
Ahead Standard: 5,000nm or 50nm
Ahead Full: 4,100nm or 41nm
Ahead Flank: 3,900nm or 39nm (You get the idea, so that's something to keep in mind)
This is for Classes: Gar, Tambor, Gato, Balao, Salmon, Sargo
I plan everything lol, but I don't die either
