I'm not convinced these additives actually do anything to justify their cost. Diesel from the pump seems to have all the anti-gelling stuff already. I had a tractor sit with a tank of diesel for 3 months, started when it was well below freezing just fine. Infact, the reason I started it was because it was so cold the coolant was frozen.
The only problems I have had is with fuel bad from the pump.
No additives here, any tie of year.