Well, when run at 100% in a duramax it produced fumes nearly absent of oxygen- i.e. it felt like I was being asphyxiated. I didnt do a 5 gas analyzer on it, but it wasnt easy to breathe. I seem to think that the FE loss is greater than the BTU loss, but maybe it is me. I theorize it has something to do with the lubricity (3% provides as much as the 500ppm sulfur content, so what does 333% more lubricity do).
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Dont get me wrong, I like the stuff. There are just some nuances.
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