Originally Posted By: Am_Fear_Liath_Mor
Just fill your gas lighter with Isobutane/propane mix from a commericial canister

http://www.msrgear.com/stoves/isopro.asp

you'll also probably need the Brunton fuel tool as well.

http://www.rei.com/product/708996

This should in theory give you an additional 11C colder working temperature compared to butane fuel.

Actually you may find that the working temperature of the torch using this fuel may even be slighter lower as the propane content will burn of first at very low temperatures enough to warm up the torch to get the isobutane above its boiling point of -11.5C.



Sounds to me like it has more to do with the physics/chemistry of the lighter than anything else. I kinda expected that.

So help me with the conversion here, so I can decide if this is worth my while. Theoretically, the fuel mix you're suggesting should work down to about 10 degrees F, if not a little lower?

Would you think a different fuel would negatively effect the lighter, all else being equal?