Really nothing to worry about unless you're traversing the country and may have fuel you bought from a warm weather area still on board when it gets cold. The oils companies treat the fuel for the climate in that area.
Case in point, never adddd anything to diesel in AK from ANC to the N Slope. But I've had fuel gel in NM when I bought it in Albq and then went to the mountains.
If it is going to be much colder than the avg temps for the area and you're passing through its good insurance.
About 5 years ago in Denver, the oil distributors, whoever treats the fuel, skimped on additive due to unseasonably warm temps. Got a below zero snap that gelled almost every diesel in Denver including all my equipment. Couldn't buy a bottle of 911 or diesel treatment everywhere. I ended up driving home that night to the western slope in my gasser and bought out a Napa of all their 911!