Power Vision: What is the best Air Fuel Ratio(AFR) for Performance? Economy?

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A naturally aspirated engine, running on pump gasoline will normally make the most horsepower at an AFR of about 12.8 – 13.0. An AFR of about 14.6 will produce the best fuel economy. Dynojet normally creates tunes with AFR’s of 12.8 at high load/rpm areas, AFR’s around 14.6 at low load areas, and AFR’s between those numbers at other areas.

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