Fuel having a high ´natural´ cetane number obtained through high energy paraffin content may provide better fuel mileage than lower energy fuel or fuel with poor natural burning characteristics plus a cetane improver, if ambient temperatures are adequate to prevent gelling of the high paraffin fuel.
I purchased a 2005 bonneville gxp, and the fuel mileage sucks.
This index is essentially the opposite of the octane rating, where a high octane fuel resists spontaneous ignition, and therefore does not tend to ´knock.´ The cetane number of 100 was arbitrarily assigned to ´cetane´ or n-hexadecane, a straight-chain aliphatic chemical compound that burns very well, in the single-cylinder test diesel engine.
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