I went back to TDR Issue 36 (pages 24-28), which exposed the premium diesel designation as a justification to charge more for something that is better, but not necessarily better in ways that are important.At the heart of the article is the research of Amalgamated, Inc, a supplier of bulk fuel additives to terminals and distributors. Their investigation showed that the standard for premium diesel was so loose that fuels could legitimately be labeled premium and still burn no better (or even worse) in the vehicle than non-premium fuel.In particular, fuels with no improvements in energy content, cetane number, lubricity or low temperature operability could all legally and legitimately carry the premium designation!