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So after LOTS of research, it turns out that my Subaru Forester XT is running at 10.5 AFR at WOT because Subaru's don't like our 95RON fuel very much and it's a safety precaution to add an additional margin for error to prevent knocking if I ever tried filling up at a dodgy fuel pump in rural Africa.


Actually running rich is less dangerous than running lean. I don't know specifically about Subaru, but in general, running lean can cause detonation more easily. And yes, while 14.7:1 is the stoichiometric ratio deemed as perfect for an air fuel mixture, running rich has the big advantage of reducing the chances of pre-ignition or pinging. In a turbo car, ...

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