ULSD= Ultra Low Sulfer Diesel. I'm guessing it is just a more refined petroleum product. I don't believe the cetane is any higher than present diesel. Just better emmsions.

IS it better? Matters how you define "better"

Will ULSD show better emmsions than 100% Bio-D (B-100) I dont think so. If I understand this all right there are NO sulfers in Bio-D

Will ULSD be more available than Bio-D. odds are yes

Will ULSD be better for your engine than Bio-D. Quality Bio-D is better IMHO.

Which one will be the most expensive. If you brew Bio-D ur-self then it is cheapest. Othewise it's probably the most expensive of the two.

__________________
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