The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites and causes engine detonation. The higher octane rating the less the risk is for knocking.
There are two ways of measuring octane rating: RON and MON:
RON= Research Octane Number
MON= Motor Octane Number
The MON number is lower than RON.
There a three ways to present octane rating:
1) RON (EU)
2) MON
3) RON+MON/2 (USA)
In the US they use the formula (RON+MON)/2 which gives a mean value of (98+88)/2=93 octane
- Low octane fuel can damage the engine, it increases the combustion and causes damages to the environment.
- High octane fuel increases the life of the engine, reduces fuel consumption and reduces environmental stress.
More information at: http://en.wikipedia.org/wiki/Octane_Rating

Cetane rating is a measure of the combustion quality of diesel fuels. A diesel fuel with a high cetane number has a high tendency to autoignite.



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