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Does the trip computer on my car give accurate fuel economy readings?

My Ford Mondeo the dashboard info tells me my average mpg is 57.2 - way above what I see on Real MPG. Could this be a true figure or computer error?

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Just a standard error. The computer does not actually meter the fuel, it only 'estimates' the economy. Try a couple of consecutive brim to brim fills to calculate what it is really doing.
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