I have a 69 220d/8, which obviously doesn't have a fuel heater in the tank. At what temperature does #2 diesel begin to gel, so as it can no longer make it to the IP? Do truck stops sell #1 fuel in the winter? Are there any anti-gelling additive's I should use? I'll be driving through Minnesota, SDakota & Montana, so am expecting very low temperature's. Any help would be appreciated.