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This article is from the Gasoline FAQ, by Bruce Hamilton with numerous contributions by others.

4.10.3 Antiknock Index ( aka (RON+MON)/2, "Pump Octane" )

The ( Research Octane Number + Motor Octane Number ) divided by two. Limits
are not specified, but changes in engine requirements according season and
location are discussed. Fuels with an Antiknock index of 87, 89, 91
( Unleaded), and 88 ( Leaded ) are listed as typical for the US at sea level,
however higher altitudes will specify lower octane numbers.

 

Continue to:

• prev: 4.10.2 Vapour Lock Protection Classes
• Index
• next: 4.10.4 Lead Content

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