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When I did plugs in the Subaru, I removed Autolites that I had put 30kmi on, and replaced them with the same part number. There was no ScanGauge-discernable change in fuel consumption at idle, idle RPM, or fuel consumption in neutral at 2500 or 4000 rpm. I didn't bother to look for an impact on my fuel logs, since those go up and down all the time.
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