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What kind of fuel shoul i use

(1990 Cadillac DeVille)
in Fair Lawn, NJ on May 17, 2010
what type of gas should i use
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on May 17, 2010
Regular 89 Octane should be fine
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on July 01, 2010
I have heard to put the super unleaded only. like one grade up from regular. My gas flap also has a sticker on the inside saying that.
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