Dealers have been told not to discount. You may have a better chance of getting them down by cross-shopping (say) a CX-5 against the Tiguan and getting a price for similar spec vehicle.
Then go to the VW dealer with the Mazda contract/price and tell them they have to work a bit harder to get your business. There's still quite a few $ of pure profit in the dealer delivery that they can easily knock off (if they chose to).
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