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Better than ScanGauge (which in my experience is really lousy at measuring fuel consumption). Bought my 2000 Insight in '03 or '04, with just about 50K miles on it, showing a lifetime mpg of around 50. Reset it soon after, and over the 110K miles since have averaged 71.4 mpg. (And that's driving mostly in mountain country, not the best for economy.) So reasonable driving can increase mpg by at least 50%.
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