Government Mileage Rates > Information Source
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.
Sonex Research, Inc., a leader in the field of combustion technology, is developing its patented Sonex Combustion System (SCS) piston-based technology for in-cylinder control of ignition and combustion, designed to increase fuel mileage and reduce emissions of internal combustion engines.
I own a 95 gas wagon and over my year-and-a-half experience (around 17k miles) during which I consistently tracked and calculated fuel economy at every fill-up (and there are a LOT of ´em in there, believe me), I have never realized less than 9 mpg for a single tank of gas.




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