I'll try to spoil your self-satisfaction a bit with some excerpts from "U-Boot's Commander Handbook".
Quote:
B. Preparing for the Underwater Attack.
105.) General rules for the attack.
[...]
c) Never delude yourself by assuming that it is right not to attack on the instant, or not to hold on the enemy with the utmost determination, because there may be reason to hope and believe that a better target will subsequently be found elsewhere. What you have got, you have got. Do not let such considerations give you the idea of trying to save fuel.
[...]
C. How to deal with Convoys.
[...]
311.) In keeping contact with convoys, and carrying out the attacks, no attention should be paid to consumption of fuel, provided that enough fuel is saved to enable the submarine to return to its base.
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Following the above rules (as well as other listed in the handbook) makes things much tougher, but in the same time much more interesting (for me).
Source:
http://www.hnsa.org/doc/uboat/index.htm