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Originally Posted by RunningTooHot
One other thing I was wondering about: I believe that the cetane rating is solely a measure of propensity to combust. If the energy content (BTU’s) of *any* given diesel fuel is the same, then would it be logical to assume that there would not necessarily be a gain in fuel mileage due to higher cetane numbers. (Or does higher cetane diesel fuel necessarily coincide with higher energy content as well?)
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Yes cetane rating is the measure of how easily diesel fuel combusts. I don't think higher cetane fuel would result in higher fuel mileage, but it would certainly result in quieter engine operation. 54 cetane fuel would be awesome and it would probably eliminate the combustion knock that my W124 has. I wish I could get my hands on some right now. 
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2004 VW Jetta TDI (manual)
Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL
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