Adding anti gel fluid to my fuel tanks.

Getting the water out is important, shutting down with tanks near full helps accomplish that.

The DD15 I have been driving has a heated Davco plus the the water separator on the engine, which has never shown red(needed to be drained).

I don't add antigel , but I fuel up where I run, don't go very far south, and I've observed the delivery of pallets of cold weather fuel treatments at several places over the years, and the guy dumping in a bucket while making a fuel drop. The pumps will gel, too, I saw that getting a bulk delivery while farming, poor Stu, may he rest in peace, couldn't figure that one out, but I did.

Bio isn't sold at 100% except in special cases, most limit it to 20% or less, b20, I saw one which said 19% or less. New bio is a different process, utilizing heat, pressure and an additive(methanol, iirc) to reduce the viscosity of the esters to be compatible with the mix and meet the cloud point, pour point specified.

I don't worry about that at all. The KWIK locations in Iowa, Minnesota, and Wisconsin sold premium diesel with antigel guaranteed to the mid 30sF, not to gel. If I was worried, I found some of that.

Lastly, a driver I knew well always added plenty, and gelled hers up really bad, it needs to be added at the right time and agitated plenty, as, if not blended enough with fuel, some of them will plug things up, too.

.