How is "Fuel usage" determined on my CarChip & Connect?

Fuel usage (consumption) is based on a calculation using the mass air-flow (MAF) sensor, engine speed (RPM) and vehicle speed. We then obtain fuel economy (mpg or L/100km) from the fuel consumed and the distance traveled (one divided by the other depending on the units used). Usage won't be shown if the vehicle doesn't support the sensor.

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