Why dont you read REAL values from fuel tank?
You can check it at hidden menu of KOMBI by holding the odometer reset button about 15 secconds.
Then, you have to unlock it at 19th option (you have to introduce a number result of add the last 5 digits of your serial number)
Then there is a option (when you unlock it) that shows you both fuel tanks meassures...
Regards from Spain!
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