Before I really got into this farming for a retirement time killer business, I did try filling a 5 gallon can when it was -20 to -30 and barely got any flow trying all 4 of the station's diesel pumps. Granted the fuel is stored underground so it must have been a pump problem, but I wondered how people with diesel trucks got fuel. Fuel at the on-road pumps was advertised as #2 with cold-flow additive between October 15 and March 15. So I went to the specialty pump island and got my 5 gallons of on-highway #1. Now come November, I fill my fuel trailer with #1 in my rear 100 gallon tank and #2 with cold flow in the front 100 gallon tank. This winter we have had much milder than normal temps, probably only a dozen days colder than -10, so I only got 50 gallons of #1 and blend it with fuel from the #2 tank every time I fill. But yes, I have run into the case where I can't pump regular #2 from the pumps at temps lower than 20 below.