In TMO, ahead standard is set to be the most fuel-efficient speed, as a rule of thumb. Generally this is around the 9-12 knot range for most subs.
In Stock, I honestly have no idea what the most efficient cruising speed is.
Best advice I can give it keep your speed on diesel engies at around 11 knots, as it is now, and when/if you fuel on that runs out, run on your batteries at 1 knot.
Batteries will last longer the lower your speed, if you set your speed manually to 1 knot (you get manual speed setting by switching meters, much like the depth gauge and rudder controls), you will get a lot more range out of your batteries before depleting them.
*EDIT* I just read Armistead's reply, and his is probably more accuarate for TMO 2.1, I still run 2.0. So my information is apparently somewhat out of date.
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