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Originally Posted by FrayAdjacent
Stick with 91/93 octane. Your engine will run best on it, and get the best efficiency.
In engines with higher compression ratios, where higher octane is recommended, you can lose power and possibly damage the engine if you use lower octane fuel.
Vice versa is not really true, either. In a vehicle that runs normally on regular, you gain NOTHING by using higher octane fuel.
Higher octane ratings in fuel only increase the fuel's threshold for detonation. In high compression engines, or forced induction systems, it is necessary.
You bought a Porsche. You didn't skimp. Don't skimp on fuel.
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I couldn't have said it any better. You're absolutely right! For example, my last car that I had used regular gas, then I dropped a Jackson Racing Supercharger in it and I had to switch to a higher octane fuel. More oxegen per ltr. of gas burns faster and therefore runs leaner, not richer. If a car requires a leaner mixture of gasoline I would not use a richer version because if will not co-inside with the cars CPU and air/fuel ratio.
