Most stations in my area, probably Flying J and Pilot included, start blending their B5 diesel differently in the winter. Some stations even have pumps with straight #1 diesel. I always thought straight #1 diesel was more kerosene, never heard of it referred to as dehydrated fuel.
I realize there is a ton of B20 diesel sold out there in Oregon and California. I would suspect they have to blend it differently for the seasons. Usually when they start blending it differently the cetane level drops slightly and you may notice less MPG.
I add Diesel Kleen when I fill my tank. When the temps start to fall I switch to the Diesel Kleen for winter use (grey bottle I think).
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