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I can say this, While I was here last time I could notice a small difference in power and the sound of the exhaust in my 2011 Escalade ext.
I also have a Tuner car, 96 Eclipse gst. It has been built to the point where I will no longer drive it and it pretty much just sits, I made the mistake of putting WAY 2 much POWER in a car that is not designed to handle it... It's to dangerous to drive... anyway, years ago, before changing the stock internals, I once used 89 octane in it, figured it was only the highway so no big deal. actually the car barely ran and until I added octane booster to it. After that experience, I'm picky with my gasoline.
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