The biggest mistake people make is getting battery damage and not turning the battery charge off. The batteries get damaged they will never stop charging until you cut them off. This can kill your range by 50%.
If your tanks get damaged, you see the result of that right away with a message that you've lose however much fuel, but after that they don't leak.
Not sure about stock, but most supermods like TMO have all the range and milage icons, just set your waypoints and you can get a range to end at current speed, ect...That way you can figure if you have enough fuel to speed up more than 10 knts.
As stated, charging batteries uses a lot of fuel. You save nothing by running submerged, in fact, you waste a lot. If fuel is a concern only run submerged when needed.
Ye, you can run 1kt all you want on the electrics, just surface when needed...we call that the crawl...most can't spend hours getting through it....
In the end...you run out of gas, you shouldn't be commanding a sub. Turn your boat over to the XO and take to your bunk in the fetel position...
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