Generally, one gets a more favourable exchange rate in European countries than in the U.S. (The spread between the buying and selling rates is less). If possible, avoid changing large sums at airports.
Yes American version of Audi could be cheaper, but German version is way better is you consider brakes and safety equipment.
gernany
euros were made when west Germany and east Germany were reunited !
Germany uses Euros
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It will probably cost you more shipping the car over from Germany, because the car was built to European standards not American. Why don't you look into the European Delivery Program? I know Mercedes-Benz offers you a discount on the vehicle, then you go pick it up from Germany, drive it around Europe for as long as you want then take it back to any of the designated ports and they'll ship it to America for you.
As of 2014, there is not country that uses the Deutsche Mark to buy things. Until 2002 it was the official currency of Germany and Kosovo.
EURO is the currency of Germany.
Spain Germany england
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