I use Stanadyne on a regular basis. But after the other day I don't think I will be using it in the winter anymore. The other day I went to fill up my truck. Pulled out my bottle of Stanadyne that I kept in the truck ( I always keep a spare bottle in the truck in case no one has it when I need it). Went to pure it in the tank and low and behold. The stuff was gelled so bad it wouldn't pour out the bottle. Wasn't frozen, it was still smooshy. But so thick it wouldn't pour. It was only 11* outside. If that's what happens to it by itself, I'm not sure if I would want it in my tank adding to the gelling point of my fuel.