graywolf wrote:
> Electric motors and generators are about 30% effective. 30% of 30% is 
> about 10%, so regenerative breaking gets back is about 10% max! That is 
> better than a kick in the pants*, but not much. RB is mostly a feature 
> that cost little to implement and sounds good in the advertising.
>
>
>   
Not true.   A multi-phase AC motor can be upwards of 90% efficient 
(which I believe you mean to say instead of "effective") .  And usually 
at least 80% these days.   30% would be more typical for a pre-1970s DC 
motor. 

On the other hand, a gas motor loses around 60% of energy to heat (not 
considering braking).



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