Thanks everyone! Yes, I did single wick this, but it is the 8 oz, not the big ones...those I would definitely double wick. (Although I had trouble with another square jar so I may give up on them altogether!). I used a CSN 11 in this. I think I could have used a 12, but after 4 1/2 hours on the first burn it left a crust on top of course and just nearly reached the glass walls except the hang-up in the corners. It's Peak Cinnamon Buns so it is a heavy oil and I think the 12 would have done a better job. And thanks Lisa for the CSN's!!!