91 or 93 Octane, which is more common? - Focus Fanatics
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Old 03-01-2011, 04:24 PM   #1
MacAttack
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91 or 93 Octane, which is more common?

I was under the assumption that only Shell would have 93/94 octane, but on my way home from work today I noticed the gas station closes to my house has 87/89/93.
Trying to find octane levels for gas stations is hell online

I'm getting a tune, and originally I was going to go with 91, but now I'm starting to wonder if 93 would have been the better option?

I know with 91 I won't get knocks if I end up being forced to go with 93, but the other way around would cause knocks. 91 may seem safer, but if 93 is more common, and if it would give a better boost in performance, I'd rather go with that.

So, which is more common/what do you think I should go with?


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