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What year is your Suburban? With older vehicles, if they pinged on grades , you could move up to the higher octane and benefit. Now with the new computer engines like my 05 V10, the computer is set up for 87 octane and it will make adjustments for altitude. To get a benefit from 89 or 91 octane I would have to put a chip in my computer, otherwise I just waste my money. My V10 does great on 87 and I have never heard it ping, just gulp . LOL.
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