93 octane gas only?

[MikeinLA]

I don't think I've run into higher than 91 octane. Is there a station that routinely sells 93 octane as their premium? I ran into 100 octane racecar gas once, but it was 5 bucks a gallon. Ouch!

Mike

[spark00]

Originally Posted by MikeinLA

I don't think I've run into higher than 91 octane. Is there a station that routinely sells 93 octane as their premium? I ran into 100 octane racecar gas once, but it was 5 bucks a gallon. Ouch!

Mike

come to east coast and see 93s. well, i think it all depends on which state you are in but in VA/DC/MD you have choice of 87, 89, or 93 and no option for 91. i think i saw 91 in Ontario and NJ.

i think i read somewhere that there are 2 methods of calculating the octane rating. maybe 91 served in CA is same as 93 served in DC area?

[trube78]

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