Here is a thought... . if you live, or travel in Canada and buy fuel there, your fuel has been treated... its a national standard (Canadian Govt) to blend down the fuel so your protected... here is left to the local distribution system... as it gets colder they (local dist) blend down the fuel... the problem is that the newly blended down fuel is dumped into tanks in stations so that it takes a while for the fuel to get mixed and caught up with the temperature...
I'm in Spokane and we had a school bus fleet here get caught and 10 min from the bus barn 10 or 12 of the buses stalled from gelled fuel... I use a product all year that adds to the lubricity of the fuel as well as blends it down to prevent gelling...
Of course, the fuel distributor doesn't want to add chemicals to the fuel unless it has to... it just add's to the cost of the fuel...
Hope this helps... .
HEY George, how's that addition to the house coming along... .