On Mon, 11 Jan 2010 17:01:49 +0000, Grimly Curmudgeon
wrote:

Also, mentioning putting petrol into diesel isn't relevant to a heating
oil thread. It would be pretty stupid putting petrol into a kerosene
tank.

Until about 15 years ago the US and many others in the polar regions
used to use a 50-50 kerosine-petrol mix (called JP4 or F40 or AVTAG)
precisely because it didn't freeze until about -60 deg C meaning it
could often be kept under cover or buried in a snowbank until it was
needed. It is a bit of a dodgy fuel though needing very careful
handling but it was extensively used for cooking and space heating
purposes by almost every one of the Polar bases.

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