This was a concern in developing GWX. The ranges of the U-boats were tuned to be (on the average) the normal ranges for each boat at ahead standard. Sea state has a major effect on fuel economy. (and in real life, so does wind, ocean streams and circulation, quality of oil, state of the engine, etc.)
Using the battery doesn't help, as recharging requires one engine to run to supply the energy to run the generator. I am not sure of this, but I suspect it would worsen markedly your range as pushing an U-boat against the resistance of sea water as opposed to air should increase the forces necessary to move the boat.
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Irish1958
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