Over here on the uncivilized part of the globe all I can get is Bil-Hee Joh-Bap butane and bulgogi marinade, and it burns really dirty. On my soft flame lighter you can see a build-up of soot from burning this stuff. I think it is Zero-X refined. I appreciate a lighter that can handle this fuel, but there aren't many. Jetlites do seem to work well with crappy fuel, but they too will give up eventually.