What I know is that fuel consumption vaired immensly depending on whether you ran at low or high speed - it varied much more than compared to, say, a car. When there was operation Paukenschlag, Germany sent two VIIc U-Boats from France to America (U.S. coast!!!), and obviously it worked, but they had to travel very slowly, probably using one engine only. By the way: Lehmann Willenbrock was one of those guys (U-96)!!
Cheers, AS
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