Normal has unlimited fuel. When in your office in base look to the left and you'll see a radio. Click on it to customize career difficulty.
When you go 1/3 underwater the game sets it to 3 kts. Manually adjust it to 2 kts and you can stay down all day.
Thats about the TC I use.
Slow convoys seem to do 5-6 kts. Medium I'm not sure but seem to average 8-9 kts.
The mission requirements are tricky. I think you have to sink a certain tonnage within a small area. Theres a thread here that describes what must be down to get a sucessful completion. I dont worry about it too much and just sink ships.
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