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Generally, it's easy to screw things up when you don't have proper feedback.
You really need to have a wideband sensor to monitor what you're doing. You cannot tune appropriately with a binary sensor.
You should also only lean it out at low loads. 80 mph isn't exactly what I would call a low load on a car with an average CdA.
And finally, if your mileage is crappy, you are probably running too lean.
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