The only way I could get my fill plug off was to VERY SECURELY get the allen socket into the fill plug, jack the car about an inch above the jack stands(leave them in place), insert a third jack stand under the handle of the breaker bar, and lower the car onto the breaker bar/fill plug. Lower until the regular jack stands catch the car, then repeat if necessary. That fill plug almost supported the entire weight of the car before it started to give. It might not be the most conventional way to get a tough bolt, but it sure beat putting that kind of torque on things with me under the car.
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Brian Smith
'91 C2