Diving increases fuel consumption! When on the surface 1 engine runs on flank to recharge. The distance travelled below the surface is less than what you could run on the surface. As in real life you should only dive when necessary and once/day to make a trim dive.
Later in war it is to dangerous to run on the surface. So your trips will become shorter (distance travelled) but due to the decrease in speed the same length (time). oh Crap the game ends in 1943 so scratch the last comment.
Best economy for a type 7 was about 8 knots (SH3 and SH4+OM). So ahead standard is abit to fast but I don't think the captain would order 8 knots, I think he would use the telegraph.
P.s. I do not own SH5, so I don't know how hard the game is. In my SH4+OM games the bay of Biscany is starting around 1942 deadly, from air attacks. You should see this by better flak guns and conningtowers.
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