Here is a website that talks about fuel pipelines...It turns out that "batches of refined fuel" can indeed be seperated. I'm going to do some more searching to try and determine who gets what in terms of diesel fuel blends. If anyone has any other info, please post.

How Pipelines Work

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7.5 3500QC 6.7CTD 68RFE Build date June 2007
Superchips tuner 3808, Boost/EGT Laser Gauge, Airaid cold intake