First of all, what type of boat were you in. In a Type VII, sailing at 1/3 speed (9 or 10 knots) will get you anywhere in the eastern Atlantic (off Britain or France) from Wilhelmshaven or Kiel using only about 25% of your fuel. That leaves you several weeks of patrol time if you head back home with 35% left (gotta make sure, you know). Make sure you're not running out there at Standard Speed or faster. That will use up your fuel way too fast.
If you're starting from France in a type VII you should have plenty of fuel to reach mid-Atlantic and back, if you do your cruising at 1/3 Speed.
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