conserve fuel, and take your time reaching the patrol grid, save torpedos for juicy targets... i mean dont plow two steamers into the side of a lone small merchant en route to the grid... shoot only if something really juicy comes along.
after about 2 weeks of travel to the grid, set on station and patrol patiently and slowly, conserve fuel by hunting almost entirely submerged. Remember massive canadian and british ships did sail from American waters. you may fond some good targets there.
every tactical consideration you make should revolve around fuel economy. dont chase contacts at high speed, dont sail surfaced in rough weather. you know the drill.
Wait out the patrol as long as possible, procrastinate in the grid, patrol it for 2 or 3 days instead of one. Plot your return voyage so that you pass close to a location where you expect to encounter a resupply ship. when the resupply ship becomes active, dock with her and head for home when your done refueling.
Good luck!
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