[The Newell]

Thanks David, We appreciate the update.

Well, they DO mix a lot of butane down south and yes, it does not vaporize as well in very cold weather. Some blends may be as high as 70-80% butane. Butane boils at right around 30 degrees F., so pure butane wouldn't be worth much on a cold night. Propane boils at something like -100 F and a mix of the two boils off somewhere in between. Plus, I suppose drops of liquid butane might condense out on very cold surfaces, though, and maybe that causes problems in the burner tube or orifice on extreme cold nights.