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Mobil replied with some information that they require a min of 40 cetane, I get the feeling that is what Mobil brand diesel is and the fuel station has to use additives if they want to boost it any higher than that.
CMS call their diesel premium diesel, in order for it to be preimium though it must meet at least two of the previously stated requirements. Sure it is premium, but I think high cetane diesel (like amoco sells) seems to cost more. I rarely ever see CMS pricing any different than the other big stations. I only know of one shell station that sells diesel and their prices are insane, then again so is that whole area. It sure would be nice they posted the cetane on the pump just like the law requires the octane and the method used to derive that number.
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