it is the Gaz cart that is the problem at those temps.a insulation pad under it and a windscreen to warm it would be a big help.
part of the test was to see if the valve and gaskets would hold up at 14 below but once the stove is fired up they come to working temp no matter how cold it is.hard core Gaz users have a heavy copper wire they wind around the cart and let the other end heat up in the flame to warm the cart.i have had to pour hot water from the tea boil over a cart that was getting very low to keep the pressure up.



spoon fulls of warm water kept this cart running until the can of stew in the pot of hot water was done.
and of course the survival angle to the post is that a small stove and some Gaz just taken along as a after thought could save your skin.
if anyone who has a orange box wants to try it out under some extremes in their part of the world i would like to see your feedback.