PapaG39, I get the same, they don't match up so I have to add a bit to my settings.
As for economical speed just ask your Navigator for maximum range at current speed (one of his standard reports) and repeat at a few different speeds to find the best. Of course the reports are for current weather conditions..
One minor thing to be aware of, if you've just surfaced, one screw might be stationary while that motor charges your batteries. Unless you specifically order not to charge the batteries...
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