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>> There is, in a (relatively primitive) manual transmission. There is not,
>> however, a linear relationship between engine RPM and gasoline usage.
>
> How many cars use a transmission that would count as "relatively
> primitive"? But I do agree that there's not a linear relationship
> between RPM and MPG.
I'd say that about 90% or more of cars sold here in Europe the transmission
is a "relative primitive" manual. The reason is for efficiency, any extra
junk in the transmission (like fancy fluid couplings or multiple-clutches
etc) just increases fuel consumption. You connect the engine as directly to
the wheels as you possibly can, otherwise you're just wasting energy.
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