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A big problem with leaning out the fuel air mix is getting a complete burn, that is why Honda's CVCC engine of the early '80's got better mileage is the rich mix that was needed for ignition was next to the spark plug, the rest of the combustion chamber was a very lean mix that would otherwise not ignite from a spark and the over all mix was leaner then normal.
I think it's the same idea as direct injection, have the fuel ignite without fully depending on a spark.
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