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i use 87 in my 91 n/a. they say you shouldnt use anything higher than that in a na. if you have a turbo use higher octane gas. there was another thread im sure if you look u can find it.
yeah... only some stations have it, and when they do, sometimes they say "We have 93 octane!!" -- I only put 87 in my '91 streetported n/a -- I've heard it doesn't need any higher...
If I had a RX-8, I'd put In 91 Octane. It requires 91 or higher Octane. For now I'm using 87 on my NA. Come Turbo conversion time, I'll be using 94 Octane.