I think the difference is largely marketing. All the 6 speed gains is slightly closer ratios. Given todays VVT engines that have board flat torque curves, I just don't see the advantage. You might even see a bit of an advantage with the 5 speed as you spend less time shifting.
It really gets ridiculous when you go to 7 speeds, particularly in the vette which makes roughly 12 metric **** tons of torque right off idle to 6 grand. A reviewer for one of the car mags said the vette needs a 7 speed like it needs square wheels.
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