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"Fuel Used" value on VT Berlina instrument cluster

Zom

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Can anyone tell me how the "Fuel Used" value on the instrument cluster readout (3rd window) is calculated?

The value used to be correct, but since an engine change and tune it is now reading 10% below accurate.

Fuel guage still seems to be accurate, although 10% would be difficult to see on that.

No change to cluster, tank or tank sender. Same ECU.
 

jughead1

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These clusters are adjustable by plus or minus 10 %. Maybe the previous owner had adjusted it up 10%, and when the battery was disconnected it returned to 0?
 
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