Which race gas? posted by TwinTurboPete on May 28, 2003 at 11:45 PM
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The thing is, you may not hear any detonation but the mixture could still be dangerously lean for the given octane. The best thing to do is make a few runs on whatever octane you choose, then pull out a couple of spark plugs and inspect them carefully. That's how you can find out if the octane is enough or not.