From the latest patch
readme:
Quote:
Max ranges for all American subs is now based on the sub carrying fuel in their main ballast tanks (S and Tench classes already had this feature). The new ranges for the rest of the subs is as follows:
-Porpoise: 22,000 miles @ 8 knots
-Salmon, Sargo, Tambor, Gar, Gato, Balao: 15,000 miles at 10 knots
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In other words, 8 knots yields the best balance between speed and range for the Porpoise class, while 10 knots yields the best results for the rest of the fleet sub classes. The best balance of speed/range for the S boats is listed in the RFB manual.