1979-1993 & 94 Conv [Subscribe to Daily Digest] |
A higher than necessary octane will NOT increase your mileage and has been reported to decrease mileage. My 1991 2.1L runs great on 87. Occasionally a n/a will require 89 because of knock. Notice how the engine performs under WOT/load (very slight ping can be detected if premature detonation is occurring) and buy the minimum octane necessary to prevent this.
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