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.|||Use whatever Porsche specifies for the engine. I am sure it is premium unleaded. Pretty much everything Porsche is high performance and their engines will need premium fuel for best performance.
From a Car And Driver long term test of the 05 Cayenne:
"Fuel economy was a concern for a vehicle this large. We averaged 16 mpg, splitting the EPA 14 city and 18 highway ratings. And the premium-fuel requirement pushed at least one fill-up to $100"
There ya go.|||Whatever the specs say. Usually it says on the inside of the fuel filler door.
Using lower grade gas than recommended can run into knock issues and too high of grade is a waste of money.|||Yes, the minimum grade will be listed on the inside of the filler door. However, my 911 says "Min 93 Octane;" something not available here in the western U.S. Check your owner's manual. Mine says automatic compensation is built into the car for slightly lower grades.
In Salt Lake City, the best Premium gas is only 91 Octane. My car runs fine on it. Don't put anything less than the best available into your Porsche.|||Read all the others and simply put, nothing under the highest Ron 91-93 the top $$ range for best performance and MPG.|||definitely nothing lower than 91. Especially since it's the S.|||nothing lower than 91 octane... high performance cars need it... low octane would cause pinging and weaken the performance
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