Exactly my point bigger cars larger discount..also model discounts vary ....and to be honest there's far too many variables when it comes down to getting a car discountA1 & A3 discounts will always be less than the bigger cars, as they are easier to sell, and are more likely to be bought privately.
A4 upwards are more likely to be company cars. Plus I suspect there is more profit (from the sticker price) building an A6 and there is building an A3. So more room for discounts.