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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?

Asked on 15 November 2018 by Jim Livingstone

Answered by Honest John
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.

Real MPG enables you to register the fuel economy you are actually getting against your make and model of car, its engine and type of transmission.

Every time you enter an average consumption figure against your car, the overall average automatically adjusts to reflect it.

Real MPG
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