RPM Airgap vs. non-Airgap?

GoodysGotaCuda said

I feel your pain with the crappy 91 oct. we have it here in vegas. I have to run about a 35-40% mix of 100oct with 91 on my 9.7:1 318 :sad1:

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I guess we must be lucky up hear in the north east. I have never seen 91 octane (other than at Sunoco as a grade lower than premium) being sold as premium. All stations have 93 for the premium grade.