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FYI, on a STOCK untuned engine, I have seen my AF Ratio in the LOW 10's in WOT. That is how rich the stock tuning is (as a prevention for warranty claims).

Tuned engines usually lean this to 11-11.5:1 (still a little rich, but a safety precaution by most tuners). This is why even a performance tune usually gives better fuel economy than the stock tune.

As a reference, most Naturally Aspirated engines usually obtain max power around 12.4-12.6:1.
 

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