[Excaliber]

Lower octane fuels are more likely to 'cause engine "run on" after the key it turned off IF your engine is prone to such a condition. Some are, some arent. Idle speed, type of carb, etc also play into this.

I'm not sure I would charaterize higher octane as "slower burn" rate, it's a more "stable" burn and NOT as easily subject to self detonation.

Concur, if your engine does not require higher octane your throwing your money away and NOT increasing power in the least!

Octane boosters as found in the "store" are a joke. They say the will raise your octane 2 or 3 poiints? So thats 94 octane to 94.2 or 94.3 octane. Do the math on the cost, it's a rip off.