Question: What is the basic operating pressure of an autococker?
Answer: Most autocockers operate in the neighborhood of 300-400. Although some claim that they can get their cocker to cycle at 150psi or so, this is not the most efficient setup for your cocker. Proper setup and timing can reduce chopping. Do NOT be mislead by the common misconception of: LP = the best.
If you wish to attain better efficiency, a spring kit and sweet spotted inline reg will do wonders.