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The only advantage I can think of is with a vehicle that has carbs. Often (but not always), the higher octane fuels have less Ethanol. Ethanol left sitting on carbs leads to fouling. So, higher octane, which may have less Ethanol, gives you a better chance of not having to deal with fouled carbs down the road.


In the case of topping off, it would make absolutely no difference other than costing you more at the pump. Octane is a rating which would indicate how hard it is for the fuel to burn. The higher the octane rating, the harder to burn. If anything, leaving gasoline for longer periods of time is going to make it harder to burn, thus effectively raising the ...

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