I have always used brand specific fuel in my lighters. I currently use a S.T. Dupont Extend lighter and use Dupont Extend fuel. I did fill up during the SoCal herf from one of the many cans of Lava fuel that Poker had placed around, did not have a problem and noticed many others using it. Lava seem sgreat for the money although I don't know the long term effects. Maybe Poker can elaborate.
I found out the JR Cigars is well stocked with Lava Butane fuel.
Problem is that they can't ship it to customers due to it being considered a hazardous substance.
BUT, if you live within driving distance of one of their E. Coast stores, you can buy a can for $3.50.
P.S. Maybe someone can arrange a group buy if we can find a way to ship it cheaply.