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When I drove through Colorado last year in mine, I ran 85 octane in it as I went above 5000 feet. I've never been above 5000 feet before that, but the car had 0 power. I am talking like 2nd gear to stay moving on the interstate. The next tank I put the highest grade in it I could, and it was much better. Still down on power, but I could get by with 3/4 depending on the steepness.
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