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trube78 · 06-20-2007, 07:37 PM

It varies by state or locale. 93 Octane is available on the east coast, 91 is the max in many states. You will also see different maximums in Mountain areas. So ... yes it is available but probably not in your area. However, unless your Boxster has been chipped, the factory ECU is tuned for both 91 and 93 Octane U.S. gasoline. It should provide optimum power and torque with either. Increasing Octane to 95 without reprogramming the ECU probably won't buy you anything either. The ECU will be unable to advance the timing to take advantage of the higher Octane. Although I suppose you could burn hotter plugs which may get you something.
ATB,
Tom

06-20-2007, 07:37 PM	#16
trube78 Registered User Join Date: Jun 2005 Location: Blacksburg, VA Posts: 49	Octane Rating It varies by state or locale. 93 Octane is available on the east coast, 91 is the max in many states. You will also see different maximums in Mountain areas. So ... yes it is available but probably not in your area. However, unless your Boxster has been chipped, the factory ECU is tuned for both 91 and 93 Octane U.S. gasoline. It should provide optimum power and torque with either. Increasing Octane to 95 without reprogramming the ECU probably won't buy you anything either. The ECU will be unable to advance the timing to take advantage of the higher Octane. Although I suppose you could burn hotter plugs which may get you something. ATB, Tom