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Where I live the extreme lows are in the teens for a week or two. With a tank heater french fry bio works in my scout with a nissan 6cyl turbo diesel. It has two tanks so one is diesel and the other is french fry. I switch to the diesel about 5 miles before getting home so it doesn't clog the carb and fuel lines in the winter. I think it starts to solidify at 40 degrees.