If there is no petcock, it was either removed, not tightened and worked its way out or was over-tightened and stripped the threads so it was able to fall out. Hopefully it was not the last option.
A gallon of oil per thousand miles is somewhat on the high side even for a two stroke. If you are filling the oil to the full mark each time, you might find that your oil consumption is reduced if you try to keep the oil level 1/2 way between full and add. There should be 1 gallon between the two marks. Adding a 1/2 gallon at a time when it gets to the add mark frequently results in less total oil usage than going all the way to full but it does involve adding oil more frequently.
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