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Old 07-24-2013, 12:14 PM
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Octane serves one purpose, to prevent pinging/knocking actually called "pre-ignition". Higher compression motors, to include supercharged (Turbo'd/Blown), require higher octane to prevent pre-ignition. This isn't to say that there aren't other issues that can affect octane requirements. Elevation for example, higher elevation reduces required octane levels. I personally run 85 octane, but I live/drive at 4500 feet elevation. Computer controlled vehicles skew things a bit as they can control pre-ignition by retarding ignition timing to a certain extent.

So, run the octane the manufacturer recommends. If you've modded your motor to higher compression values, through a variety of means (pistons, heads, supercharging, etc...), use higher octane as required to prevent pre-ignition.

The moral of the story is that higher octane does not translate into higher powered gasoline.
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