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2013 Porsche 911 Carrera Cabriolet Long-Term Road Test
Edmunds.com
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towards the bottom see Regional Variations very interesting to see how high the octane is Vs. USA
BTW - quite a few 997.1 owners experience(d) occasional pinging on 91 octane (even Tier 1 gas). Many of us will blend some very expensive 100 octane when tracking our cars to try and alleviate. It sucks, but such is the price of living in this crazy state.