High on the short list of places you can top out a high-performance car are the unregulated stretches of the German autobahn. Dempsey believes the best steed for the job would be the Porsche Panamera GTS.

"The ride is very civilized and comfortable," Dempsey says of the $113,400 sedan, "and the thing about the autobahn is that if you're going fast in the left lane, people get out of your way, unlike New York or L.A."