Try Texaco or Shell. About the only visable difference is price and nothing on the pumps. The way you've keep records, you should see a difference in mpg without additives. I've seen a big difference (using Texaco Diesel) in mpg and fewer regens. Premium Diesel is a big deal in Europe and other countries...I don't believe that you will be able to fuel up at the same places that cater to big rigs. Premium Diesel can be purchased where cars and small trucks fuel up. Usually there are no big rig fuel bays at these stations. Proof is in the pudding .Give it a try.

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