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Here in CA all we can get is 91 octane. I don't know why, I never looked for 93 until I got the Boxster a few months ago! I recall someone said on this board that CA has only 91.
Does anyone know 1)why? and 2)What is the safest method for upping the octane? I have read about adding "xylene" but I am sure there are many products out there.
Thanks!
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