In the US, gasoline is sold with an antiknock index rating that is the average of the Research Octane Number
(RON)  and the Motor Octane Number
D2699 - Standard Test Method for Research Octane Number
of Spark-Ignition Engine Fuel; American Society for Testing and Materials, 2013.
Because of these losses, the boiling point and density of petrol raise and such important parameter of petrol quality as an octane number
is reduced, which results in an increase in petrol consumption in engine operation and its malfunction.
Therefore overall result of oxygen content and octane number
of the fuel leads to low CO and HC emission.
0 (premium) Octane number
[greater than or equal to]88 (regular) [greater than or equal to]95.
By applying chemometrics to the NIR data, it was found that key properties, such as aromatics, unsaturated content and octane number
, could be determined.
Kohtla-Jarve shale oil based petrol had octane number
up to 68 and elemental composition of C 84.
So far in order to reduce the octane number
, tetra ethyl lead (TEL) has been used that functions as octane booster for gasoline Premium ON 88 and Premix ON 94.
Replacement of Regular 80 research octane number
The octane rating unit can be set up for either ASTM([R]) D 2699 (ISO 5164) (IP237) Standard Test Method for Research Octane Number
(RON) or ASTM D2700 (ISO 5163) (IP236) Standard Test Method for Motor Octane Number
Petrol car with an octane rating of more than 92, but not more than 95 by the research method, petrol car with an octane number
of more than 95, but not more than 98 on the research method
A primary reference fuel (PRF) with an octane number