On my coldest ever trip, three weeks on Denali,we used an XGK running on kerosene; it flamed flawlessly with a comforting roar. Twenty below was routine and one night we got a wind chill of -80F, and Mr. XGK still served up hot tea. If I could have just one stove, it would be a Svea - tough, dependable, and light enough. Going out in "normal" conditions, I nowadays tend to carry some sort of alcohol arrangement like a Trangia.
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Geezer in Chief