I have never had a problem with gelling in my diesels.
My first diesel truck I bought in 1995. I am not sure when I learned about diesel fuel gelling but it was likely around 2000. That truck when through some cold spells without a problem and with no additives.
The tractor I do use additives just because it will sit awhile between use and the fuel can last along time if I fill up with 12 gallons.
On the Ford that replaced the 1995 truck I have on occasion used an additive. But frankly I can only remember doing it once. And that was last Sunday.
I checked our well house hovel to make sure the two lights were running. Added five gallons of fuel to the tractor along with an additive. Since it had been cold and we are experiencing a multi week long deep freeze I put some additive in the truck fuel. NC has not had these low temperature for such a long time since 1977. Figured a bit of additive would be good insurance.
I run 0w40 oil in the truck and tractor. The truck starts right up and does not sound like it is going to cough out a cylinder like it used to with the 15w40 oil.
I swear on a cold morning with 15w40 oil the vibration of the truck could churn butter until the engine warmed up.
I do know that in January of 1996, a few months after getting the 1995 truck, I was in FLA for the holidays. A bad snow storm was head to NC so I left FLA and head back home. I had to get fuel in either SC or north GA which lasted me to NC. The last 4-6 hours was in a blizzard driving in 4x4 on I95 and I40. Talk about killing your MPG.
That southern fuel from SC or GA was find up here in the snow storm.
That is a long winded way of saying you likely won't have a problem but if it is really cold for your area a doze of anti gelling juice won't hurt. It only takes a moment to drop the juice in but it will surely take longer to ungell the truck....
Later,
Dan