In reply to:

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What is the reason why most american cars have automatic gear shift? It's much more fun to shift the gear at the time you want it. And it's really fast, too (Maybe not quite as fast as the new register-shift or a motorcycle's gear shift

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Because we americans tend to eat a hamburger with one hand while talking on the cellphone with the other.. Doesn't leave any room for shifting:)
-m

...proud to have owned one of the first Mark I units