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Have you checked the on board computer readings against your actual real life using pump receipts for litres and a gps for mileage? If you fill to visible in the neck from say the 1/4 fill line on...

Is that the model with the injector in the DPF unit? Those have been known to create a high fuel use situation, but not sure off the top of my head what years had them. Other than that, injectors...