This article is from the Gasoline FAQ, by Bruce Hamilton with numerous contributions by others.
The Research method settings represent typical mild driving, without
consistent heavy loads on the engine.
Test Engine conditions Research Octane Test Method ASTM D2699-92 [105] Engine Cooperative Fuels Research ( CFR ) Engine RPM 600 RPM Intake air temperature Varies with barometric pressure ( eg 88kPa = 19.4C, 101.6kPa = 52.2C ) Intake air humidity 3.56 - 7.12 g H2O / kg dry air Intake mixture temperature Not specified Coolant temperature 100 C Oil Temperature 57 C Ignition Advance - fixed 13 degrees BTDC Carburettor Venturi Set according to engine altitude ( eg 0-500m=14.3mm, 500-1000m=15.1mm )
 
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