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It's my observation that when they add more gears, it's rarely for the purpose of increasing fuel economy; it's purely for marketing to excitement seekers who think that they'll go faster with more speeds. Then later they make transmissions with that many speeds for fuel economy.
A 2008 VW's 6 speed transmission has the same 1st and 6th ratios as my 2008 VW's 5 speed's 1st and 5th. They just made the gear closer together...they're already way too close for fuel economy anyway.
I'm not sure that making them any closer even helps acceleration, at some point the time spent shifting outweighs the time saved by staying in a narrower portion of the powerband.
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shatto 
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