As reference for those reading this thread.
My Scangauge is never accurate, always reads to much fuel flow on higher flow rates and to low of flow rates at lower flow rates. Basically the Curve is off. Likley a Diesel Only issue . . .
Some suggestions for attempting to nail it down.
1) only change your mileage 1/2 of the way to what it should be, eliminates "bounce"
2) Keep on trying
Of course out of the 5 Vehicles I'm normally in with SGII's only 1 (the golf) has an issue.
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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