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When I changed the headers on my Subaru, my offset jumped to +15% from +7%. This I later found out was because the car was running richer than before. Scangauge II does not take AFR into equation, it always assumes a 14.7:1 AFR and i think ~12:1 for open loop.
Apps like torque pro have the ability to take AFR into consideration but they are not very accurate from my experience. SG2 is so far the most reliable and practical device I have used.
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