Stock GT is fine using medium grade. If you want better performance or if you have Stage 1, you should be using the higher octane rating.
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<b>\'04 PT GT Graphite Metalic w/Autostick: </b> Stage1, BTG Strut Tower Brace, Eibach Anti-Sway Bars, Airaid CAI, Mopar 2.5\" Dual Cat-Back (D: 14.48@93 - A/S: 14.56@90) <i>...more mods at CarDomain or PTCruiserWorld</i>
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