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Just to clarify things regarding octane boost additives, I stand by my statement above but will add that when I was racing at Mondello Park I found that the only fuel that I could buy at the local filling station was unleaded low octane, as my car runs almost 13.1 CR there was no way I could race so I used a fair amount of octane boost with no problems all weekend.
Also as most of us know the lead replacement/octane boost ones are good for valve seat recession on older engines that haven't had unleaded seats fitted, especially when used for long races or lots of road miles.
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