How does this work when you come to get a new car?
It tends to even itself out.
Low mileage = lower monthly payments and higher GFV
High mileage = higher monthly payments and lower GFV
If you tell VW you do 5k miles a year and end up doing 20k a year, you pay a lower monthly payment but come trade in time you will be offered less and your GFV will be high as they expect the car to only have done 15k over 36 months. So what you have saved in the monthly's you pay back at the end of the term
Otherwise everyone would be claiming they do a low mileage.