Ted is that the RED fuel You are using? A friend that works at Amoco in Whiting tells me that the only difference between the on and off road is the dye so they can make sure truckers do not use the lesser taxed fuels that are for the farmers.

In short it is ALL ultra low sulfur now.

This is second hand info Maybe someone could verify what I have been told.

Sid if I were not in a Northern climate the ONLY time I would bother would be to add a Gal of lucas, or any type treatment to a full tank when I changed oil and would not use it any more frequently

Ted is correct the suggestions and habits will cover the gamut.

If very very cold for a prolonged period of time I will blend #1 with #2 diesel, at least 10% kero and up to 50% kero depending on extremes.

I use kero instead of additives cause at least you can get some MPG for your money that way.