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the biggest thing thats going to kill your mpgs is not having the correct wideband with that ecu. you might have to rewire from the o2 sensor to the ecu if its not an original vx wiring harness. If that o2 sensor is not the wideband or wired correctly i'm pretty sure lean burn won't work.. so it will get the same gas mileage as the non lean burn models....
Ben
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