I used to drive transport trucks, for a living. I did it, for over 13 years. Drove pretty well, all over North America. I had the Disspleasure, of gelling up, once. Didn't totally freeze up, but experienced lost power, in the engine. I managed to get into a truck stop, talked to the service department, and they introduced me, to Howes Diesel Fuel Conditioner. They told me, not to follow the directions, because of the different additives, in the fuel, from area, to area, and different climates. For the situation, that I was in, they recommended 1 jug, of Howes, per 150 gallon tank, of fuel (1 on each side, of the truck), and every second, fuel up, to put in half a jug, in each tank. After that, I went from weather extremes, from 75 degrees above, to minus 60, below, all withing, the same trip. Not once, after starting to use Howes, in that matter, I never had a problem, with gelling of the fuel. I use it all the time, in my tractors, and Diesel pickup truck, and I swear by it.