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[MENTION=22856]Bbhaynes[/MENTION] Some people are having better luck with higher octane on the Gen2 were as some are just fine with the factory recommended 87 listed in the owners manual.  My Gen1 a different animal runs much better at low rpms and idle on higher octane, 87 is listed as capable from the factory.  On 87 the Gen1 owners manual also states a horsepower loss of about 10 when running 87 vs 91 not sure if the Gen2 gives different HP amounts for different octane in the manual like the Gen1.