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I've gone to 89 octane here in Chicago about $1.60. I have not notice any drop in performance. The car seems to like 89 better than 91 or 93 octane. I have been getting excellent performence when I jump on it. No knock whatsoever.
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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T
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