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Well, glad to know your engine is running a bit richer than it originally seemed! Does your car have a cat on it? If so (as you probably know), an A/F meter post-cat will read much more lean than pre-cat. (Hence why OBDII cars have two O2 sensors.)
12.5:1 is a good accepted safe A/F ratio, and much more fuel than this won't even do any additional cooling, it will just take up space in the combustion chamber, and possibly even makes things worse. SO, 11.0:1 will not only make less power, but it won't make you any less prone to detonate, on it's own. However, tuning a little more rich than 12.5:1 will offer you a bit more margin of error, in the event your fuel pressure drops, an injector gets clogged, etc. etc. The candle that burns twice as bright only burns half as long!
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