Do a search as this issue came up before. You should really go with what the factory asks for as that is what all the timing and fuel mixtures are based on....

Look at picking up a daily driver 4-banger to save on gas.

IMO, look at it this way...an extra 600.00 a year for premium fuel over poo-poo fuel - OR - $10,000 for a new motor to be installed.

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