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0.1 AFR is realistically going to make little/no difference. Remember it's a target but that doesn't mean it has to be that. Then the flip side is, how do you know the AFR reading is accurate? AFRs read from a single sensor are never accurate by their inherent nature. Just use the target AFR as a guideline - if it runs OK then it's OK. Richer is safer, you'll not make any more power by leaning up 0.1 AFR.
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