By the end of 1939 the U-Wafe had given up almost all operations except minelaying in the channel. The combination of shallow water, high volumes of anti-submarine forces and both enemy and friendly mines made it an extremely dangerous place to operate a German submarine.
About your fuel usage, I assume you are in a Type II, but even with that you should be able to operate in the Western approaches for a short period as long as you are careful.
Never cruise at above 7-8kts, only use full speed when overtaking or chasing down targets and only for short periods.
As long as you are careful you shouldn't need to teleport.
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