What is the best one out there and how often do you add it being im a newbie to the diesel world ?
Unless you're running home heating fuel (off road) I wouldn't be over concerned with gelling on today's pump fuel. Run addition lubricity and cetane booster
I have had pump fuel gel on me at about -30 F. I now run Stanadyne Perf. Formula at every fill up summer and winter. Since then I have run in -50 without trouble...fuel trouble anyway