This was discussed here several times in last two weeks, like here, for example:
http://www.subsim.com/radioroom/showthread.php?t=130578
Quote:
Originally Posted by kenijaru
the best mileage can be archived with a hand-set speed.
usually between 7 and 9 knots, depending on the boat. (during heavy seas, probably the same setting would be the most economical altho' the actual speed at witch the boat would move would be reduced)
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That's true, economical speed stays the same no matter what weather, you just sail slower in storms. This indicates that what is named 'speed' on the dials is rather 'engine efort'.