Guys, I hate to throw a wrinkle in here - but you have to remember that you HAVE to deal with averages. Running distance during wartime was always on surface AND sub-surface (except when transitting friendly waters). Then you have to account for when a sub may have to charge batteries vs use propulsion for motion only. And lets not even start taking into account weather and sea state..
When you look at it - your going to have to accept an average. Even were you to just take a sub, fill it up and run it at 10 knots in a straight line - your still not going to get the same results every time. *Although man wouldnt that be fun to get a group together and try - at least for a few hours!*
In reality - the sea state is going to have a huge effect on "mileage", so you have to average.
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Good Hunting!
Captain Haplo
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