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mine has always been within 1.5%
I know this because when you fill up and reset the scangauge it has a section that allows you to adjust the amount filled up verse the amount scangauge thought you used. I always seem to go up or down 1%.
I also did the math of miles/gallons at fillup and compared that with the SCGII and it was within 1-2%
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I did drive about 40miles with zero bars on the fuel gauge.
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