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Yup, lean burning will get you some mileage, just watch it on heavy acceleration if you want your valves & pistons to live. OEM lean burn engines have set conditions where they will enter lean burn mode, you don't have this.
FYI, the EFIE is a horrible way of controlling lean burn air/fuel ratios. The normal narrow band sensor's resolution is absolutely horrible at measuring anything outside of its normal band.
Not tryin to be a kill joy, just a word of warning.
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