Here’s how I learned (via an article I read in a car magazine in the 50s — was it Road & Track?) to pronounce the German name of one of our favorite cars:
I am always to amazed to hear some Porsche owners refer to their own cars with a silent “e”. Here is a bit more on the matter: http://german.about.com/library/weekly/aa020401b.htm and — wait for it …
And while we are at it, how about Japanese brands?