My parents lived in Billings and I remember the pumps having a sticker that told how they blended their fuel during winter months. It seems like starting in November, fuel was good to a pretty low temperature. Since they both passed, I haven’t bought fuel there in the winter for several years, so don’t know what they are doing now. I also don’t remember if all stations did it this way. Personally, I’d go check at a place that moves a lot of fuel to see how they blend it. Then, I’d take a road trip somewhere to burn a bunch of fuel you have and then fill with winter blend. Stopping along the highway with gelled fuel is not fun.