Quote:
Make your fuel last, in a VIIB I found 9 knots to give the best range, 8 knots for a IXB
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This is very sensible, as you don't want to run out of fuel mid-patrol. I found that travelling at 7knots for the Type VII/IX works better, as you can travel much further, but it does take a bit longer to get to you destination.
As for TC, I also stick to TCx128 on most patrols, a bit less if the weather is bad, as you can be going along at TCx128, and next thing - WHAM! your sunk by a passing ship.