Quote:
Originally Posted by rifleman13
It's very economic to always go ahead one-third in all u-boats! 
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No it's not! You can cut your range by more than 10% doing that.
Best speed* for VIIC with no engine upgrades in 7.5 knts Best speed with the most expensive upgrade is 8knts or just over.
*this is the best miles per gallon speed, it does not take time into account.
Running submerged for part of each day uses slightly more fuel per mile.