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through trial and error i have found that about a 0.1-0.2 volt subtraction from the MAF sensor signal leans out the engine nicly.
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My Celebrity does not have a MAF. But I built a device to adjust the voltage to the MAP sensor. I found that subtracting 100-150 mv from the stock signal gave it just a hint more power under light load. I did this early last summer, before I joined here. Back then it did not contribute anything to my mpg. But since ecodriving, it might be helping some.