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Message: [QUOTE="joshholmes20, post: 1063017, member: 69313"] I just purchased some 110 octane race gas (named Koch Power 110) and I am wanting to mix it with some premium pump gas to get the octane levels down some for my stock motor. Is it safe to calculate octane ratings using the following formula? Ex. For 40% Race Gas and %60 Premium (.40*110)+(.60*91)=98.6 octane Also, if anyone has a reccomendation as to what a desired octane rating would be for a 2003 YZ 125 with: stock piston/rings, stock reeds, Twin Air filter, FMF Fatty Pipe/Powercore II Silencer. Thanks [/QUOTE]