don't think so. octane levels became important after leaded
petrol got phased out. i don't know the chemical structure of a
typical octane additive, but i do know that its purpose is to
prevent detonation, or "knocking" or pre-ignition, to prevent
engine damage (imagine your air/fuel mix igniting before the piston
reaches TDC). high compression-ratio engines typically demand
high-octane fuels... rate of burn really depends on your engine
design and your jettings, and spark plug efficiency.
power comes from additives, not octane. can you find that article
again?