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International Automotive Technicians Network
Re: p0420/p0430
Posted to Technical Discussion Forum on 4/30/2023

During a single trip you wouldn't know if the mileage changed. Unless you have constantly monitored and adjusted ignition timing like the Saab APC different octane too high or too low will not alter the mileage. It may change the sound, or damage the engine if... Login to read more.