Cetane and Octane correlate to API specific gravity of the fuel. the lighter the fuel in terms of API gravity, the higher the Cetane or Octane. Custom Made Item Not Refunable or Returnable - some assembly required
How do you KNOW what your fuel is - do you trust the numbers on the pump ??? You shouldn't. In fact Diesel fuel is not even required to be listed as to it's Cetane on the pump.
You can measure it approximately with this
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