I don't remember what thread it was now, but I have explained it before that several times too. People have the misconception that "premium" gas is better gas, it really isn't, it just has more octane to resist pre-ignition. The octane rating is a measurement of a fuels resistance to combustion. The higher the rating the less flammable so the fuel won't self-ignite as it is compressed creating pinging in a higher compression engine. So the lower rated fuel actually burns more easily. You should actually run the lowest rated fuel you can that doesn't ping in your engine. When it fires too soon it creates that ping and can cause damage eventually.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!