My experience has been ahead 1/3 for a VIIb cruise speed for a patrol. Have made it the long route around the North of Britain to BE96 and back. Since you are low on fuel do as suggested and run the channel. Dive every 16 hrs and run on batteries for 8 hrs to conserve fuel. When in the channel don't go deeper than 14 meters.
I hope this helps you, good luck.
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