? Deduction of value on conversion

Hello, it’s just being discussed whether VW might take back cars in the context of conversion with deduction of value, where CO2 emissions were incorrectly calculated. Since I would like to get rid of my car due to a changed driving profile (now about 25,000 km/year), but a sale does not pay off, I wonder how much is usually deducted during a conversion? New price from the golf, see signature, were about 31,000 euros according to the list. In a cash sale today I would fill about half of the price There’s the loss at just 30,000 km too high. Would the loss be less if the car could be used for a change?