Just a update. I've been using texaco diesel fuel and also from our local kangaroo. The texaco caters to cars and small trucks while the kangaroo caters to semi's. I've seen a 25% decrease in rengens and a 1.5 mpg increase in fuel economy between the 2 with texaco being better. I'm going to try the company owned flying J next. The flying J website gives you information about corporate and franchise ownership. From other posts, the fuel mix is different between the 2.

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