Here in Minnesota, the Dakotas, Wisconsin, etc., stations switch to #1 (winter) diesel, which has a much lower gelling temp than #2 (summer) diesel. We generally do not need to put more anti-gelling additive into #1 diesel unless the temps drop below zero. A simple phone call to your local truck stop and they should be able to tell you if they are pumping #1 fuel or not. If not, put some additive in and be on your way.
As insurance, there is a product called 911 Emergency Anti-gel. This is used to help de-gel fuel that has already gelled. I had to use it once, but the temps were -5.
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