Editing Octane rating (section)

===Research Octane Number (RON){{anchor|RON}}===
The most common type of octane rating worldwide is the '''Research Octane Number''' ('''RON''').  RON is determined by running the fuel in a test [[engine]] at 600 rpm with a [[variable compression ratio]] under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane.<ref>{{Cite book |last1=Steven A. |first1=Treese |title=Handbook of Petroleum Processing |last2=Peter R. |first2=Pujado |last3=David S. J. |first3=Jones |publisher=Springer |year=2015 |isbn=978-3-319-14528-0 |edition=2nd |pages=681, 1796}}</ref> The compression ratio is varied during the test to challenge the fuel's antiknocking tendency, as an increase in the compression ratio will increase the chances of knocking.