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by bluGill 1279 days ago
number 2 diesel fuel will turn to jelly at a bit over 40f. That is warmer than water freezes. Number 1 diesel will be fine to well below zero, and you can mix them to get different gel points. There are also anti gel additives you can add to prevent gelling. Number 2 diesel has significantly more energy than number 1, and is also cheaper, so you want to run number 2 if possible.