I am an American too, renting an Audi in Germany has caused me many learning experiences. Like take the 30 minutes to learn the computer system before you take off because attempting to turn things off at speed is interesting when you cant find it.

Audi presense is nice, lane assist is nice, adaptive cruise control is nice etc etc but when its not nice it gives you whiplash or heart attacks

And that ever pervasive feeling that you know somwehere is a bug in that code which could yank your steering wheel sideways or slam on the brakes randomly