I'm probably going to give myself some bad karma here, but in 17 years or running diesel trucks I've NEVER had a problem with gelling fuel. Not sure why, because it seems like most other people have had it at one time or another.
I don't really pick and choose where I buy it, and don't routinely run treatment mixed in with the fuel. I do occasionally run a can of conditioner/cleaner through, but only every 5K miles or so. Other than that, I change my fuel filter every third oil change, and ... well ... that's all!
Maybe it's the winter blend we have here that keeps it flowing, I don't know. I do know when they swap to the winter blend fuel because I tend to lose about 2-3 mpg, but I suppose it's worth it to make sure it keeps flowing.
One of the things I've always loved about my 1st gen is that as long as I had a good battery in it it would ALWAYS start, even on the coldest mornings. Might run a little rough for a short bit, but then be fine. I worked the night shift and didn't have a place to plug in the block heater, but even then she would always start, and I would run around the parking lot jump starting gassers.
There was only ONE time it didn't start for me ... I was on vacation at a friend's house on a really cold winter week. It was about -30F, with the wind howling about 30 or 40 mph all night across the field where my truck was parked. I had a cord for the block heater ready, in case, but I wanted to see what she would do, since I didn't really have anywhere I had to go. The oil in the crankcase was so stiff it didn't even turn over. No big surprise there. I probably should have put lighter weight oil in, but I still had 15-40 in it.
20 minutes on the block heater, and she was running.
