I turn my burner down low enough so that my wort is barely boiling. My thinking is that 212 degrees is 212 degrees, and all I'm doing with a vigorous boil is wasting more propane and generating more boil-off.
Am I correct in my thinking?
Jamil Z agrees with you. according to his wisdom you want churn/movement in there, but not a violent volcano.
+1. 212 is 212. No need to reduce volume by overdoing it.