psfred is right, most standard #2 diesel travels along the same shared pipeline, and is separated and branded/additized at the terminals. Amoco Premier and Bp Diesel Supreme are kept separate from the refinery to the station, the whole way, so they are not polluted with nasty regular #2. Those who have access to this TRUE premium fuel are very lucky.

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2004 Ram 2500 Cummins HO
2000 Jetta TDI
1999 E300 (sold)