All this means is that, at these temperatures around 0C the Soto will go out leaving around 60% of the fuel (mostly butane) left in the canister about 10-15 minutes into the burn.
In fact the Soto could lead folks into a false sense of security thinking they have an hours worth of fuel left at these cold temperatures when in fact they might just have 10-15 minutes burn time.
This is my understanding as well. Which is why I'm such a big fan of inverted canisters (liquid feed operation) and a pre-heat loop.
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