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We should examine this thought about more gears being a good thing. Perhaps it isn't?
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i suppose that mainly comes down on how flexible the engine is... if it's got a wide RMP range of good torque AND efficiency that you don't need that much gears. that's why electric vehicles don't really need a transmission. an ICE on the other hand should ideally be ran at a constant rmp, so that's where a CVT could work wonders...
also the point where an engine is most efficient is not always where it provides the most power.... but than sometimes you just don't need all that power you basically have to run the engine in an rmp area where it's not all that efficient, but still uses less fuel overall
perhaps we don't need more gears but just the right gears for our speciffic driving....
what's best would be the setup where the gains cancel out the loses... but what that is... i don't know