I think what people are experiencing with fuel that supposedly is winterized is actually ICING due to WATER in fuel
and not actually gelling. People often mistake icing for gelling. They think they have gelling but actually have icing instead due to water.
Fuel is winterized in the Boston area and points farther north so it shouldn't gell at temps we saw last Saturday night. I was -9F in Nashua NH on Saturday night. That's cold enough for icing due to water from condensation but still too warm for gelling with winterized fuel. Properly winterized fuel won't gell until you get down to around -40F (-40C) but you can have icing problems due to water long before that.
I suspect ICING due to WATER
in fuel in the Boston area and not actually gelling since our fuel is already winterized. Also water ingestion will destroy the HPFP in no time at all and will do so faster than poor lubricity will.
Water in diesel fuel absolutely must be avoided at ALL costs. Fuel up ONLY at high turnover stations along major routes to avoid getting watery fuel. Go where the big rigs go. My favorite truck stop in Londonderry NH gets an entire tanker truck (10,000 gallons) of diesel emptied there every day just to keep up with diesel demand because of the heavy truck traffic. I have no worries about water at this station because the fuel is not more than 1 to 3 days old. Also regularly treat fuel with PowerService Diesel Fuel Supplement (white bottle) with every tankful to increase lubricity, provide antigel in case the fuel isn't winterized (unlikely at a high turnover station), and to take care of any water you can't avoid getting.
The bottom line is fuel quality is ABSOLUTELY EVERYTHING when it comes to protecting the HPFP and ensuring reliable operation. I proactively treat EVERY tankful year round and fuel up ONLY at high turnover stations along major routes to avoid getting watery fuel.
Good luck.