LibertyCRD wrote:
If cetane increases mileage, why does my mileage drop when I add cetane boost additive (power service in the white bottle) to my tank??
Because, simply put, neither cetane nor cetane rating has anything whatever to do with mileage.
Strictly speaking, cetane rating is ONLY a measure of how quickly the fuel ignites after injection, and it will determine noise level and ease of starting. Period.
There is some speculation that increasing cetane will increase mileage as an indirect function of earlier ignition giving an effect somewhat like advancing the spark on a gasser. This is unsupported by the evidence, however. I would refer you to the simple fact that biodiesel, with cetane ratings above 50, has about 10% less energy available per gallon, which always delivers decreased mileage, not increased mileage on honest tests, some folks reports to the contrary not withstanding.
Higher Cetane Number = easier starts, reduced smoke, less noise, fewer emissions and improved fuel economy.
Cetane is defined as a measure of the ignition quality of diesel fuel and is based on the ignition delay of an engine. A lower cetane number lengthens the engine delay and makes combustion more difficult
Higher cetane does NOT equal lower mpg. Period.
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