Maybe that is it. Traveling at 10 kts is more efficient in terms of fuel consumption than at 4 kts. I'll try that but I will be very surprized indeed if I find I can travel all that distance at 10kts and still have 68% fuel.
or
Did you shortcut throught the channel? I went by the northern route figuring the channel would be certain death...as it ought to be.
No, I did not have an option for the German Blockade mission...as I said. I went back and re-rechecked. I reload the arrived at port saved game and go to the mission briefing and the single open option is the southwestern approaches mission with a deadline of June 1,1940 and an objective of 100,000 tons.
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