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Here's what I've learned through personal experience. If your particular vehicle makes more power from added timing that 93 octane can't provide, then yes added octane will make a difference. Of course you will need to tune for it to take full advantage. Say for example you are at 26 degrees of timing on 93 octane, but add 2 degrees and still make the same power. Then adding more octane and timing won't help much (except for allowing less timing to be pulled under certain circumstances) because your particular setup was pretty much optimized on 93 to begin with. Some setups can reach their max performance on 93 without the need for higher octane, and without fear of knock. It really just depends. Of course the higher octane can provide a bit of a safety net, but that's not the same thing
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