I am down in the 55% range right now. Earlier I thought that a smoke that is more moist would burn cooler. What I found is that I would be puffing too often just to keep it burning straight, then the cigar gets too harsh. The other thing is because I live in Houston, the humidity is pretty high and I can tell that the cigars I smoke outside tend to get a bit tighter toward the end. So, I've had good luck in the low range.