Quote:
Originally Posted by CigaR007
I believe that running a higher octane increases efficiency provided that you boost the compression ratio. If the CP remains the same and the octane rating increases, odds are it won't boost fuel efficiency.
Wisdom dictates that you should use the recommended octane as specfified in your car's owner manual.
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You can also advance the timing significantly with higher octane gas, so tuning would be required. Regardless, you can't just throw higher octane gas into the tank and expect better mileage.