Fuel octane and burn speed have no specific relationship. There are very vast burning 87 octane fuels and very fast burning 120 octane fuels.
Sunoco Maximal 116 octane is designed for large cubic inch High rpm engines, it is sunoco's fastest burn rate fuel.
Octane is a measure of how resistant the fuel is to detonation, not its burn speed.
http://www.ducatimeccanica.com/gas.html
Larry