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In my Explorer I kept a spreadsheet that kept track of the discrepancies between the scanguage and my fill-up calculations. Combined with a speed adjust I ended up ~ -4% on the calibration, but I was still sometimes up to 5% off. It was generally accurate for most of my driving, but would under-report my fuel use a bit when I got a lot of DFCO cycles. It sometimes stayed on 0.0 LPK for most of a second after I would start accelerating again.
I didn't seem to have the same problem when using the same scan guage in my Versa.
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