As been said I think 8kts is the ideal for type VIIs. In order to factor in food consumption I have been using 9kts on my last patrols and that has reduced my range so that I can still do pretty much what I want, but will usually make me return to base after about 40 days or so. Sometimes with unused torps still aboard.
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...I fought in many guises, many names, but always me. Patton
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