Most of the diesel sold at the pumps is 40-42 cetane cat pee. Every once in a while you will find 46-50 cetane and yes it makes a palpable difference. The fuel we are forced to purchase at the pumps is truely crap. I can back up a 1/2 to 1 mpg difference when using Stanadyne Performance Formula in the work truck. Gotta be the cetane increase. RT

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