What grade of gas should I use on 2005 Porsche Cayenne S?

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david

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I was looking to buy a Porsche Cayenne S 2005 and I was wondering what grade of gasoline should I or have to use for it. Can I go using one type of gas for a while then switch? It has 57500 miles on it if you needed to know. I would really appreciate some answers to this, thanks.
 
nothing lower than 91 octane... high performance cars need it... low octane would cause pinging and weaken the performance
 
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