Try running at 9.5 knots while surfaced. If you click on the telegraph button (below the telegraph) it will change to speed settings.
Running submerged will not get you any further because you burn more fuel rechaging the batteries. Do most of your cruising on the surface. Only submerge when needed for attacks and avoiding aircraft.
Running at full ahead gobbles fuel, flank swigs it in huge gulps.
Good luck to you.
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