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AdBlue tanks often don't need to be filled up between maintenance, and their 25-liter volume means they may last between 10,000 and 15,000 miles before needing to be refilled.
A problem with the AdBlue system is likely if your gauge displays just half a tank of gas and 2,700 miles of range left.
AdBlue problems, although common, may be difficult to identify and costly to fix. Does the automobile still have a valid warranty? If not, was it acquired from a dealer during the last 12 months? It has to be scanned for flaws in the ECU using STAR, which may be done at a Mercedes-Benz dealership or by an independent expert.
Tank capacity does not correspond to the miles shown on the display. The gauge reads 100% yet the Mercedes Me app reports that I have 8000 kilometers left. It has from the beginning. Don't throw away your money on 5 or 10 liter containers if it won't use them. You may save 25% compared to "shop bought" top-up bottles by filling your tank with an AdBlue pump. In Germany, for instance, the price ranges from €2 to €2.5 per liter for bottles and €1.10 per liter at the pump. The last time I filled up in France, a week ago, the price per liter was €0.54.