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My Scangauge has been calibrated and accurate for several years now. My cumulative error is about 1/2 gallon, TOTAL.
True, it doesn't calculate lean burn, but most cars don't have that feature. For those that run standard AFR, it's quick and easy and accurate.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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