> > Compare the
> > cost of that new hybrid with the cost /difference/ between 
> the gas my 
> > old civic will use compared to the new hybrid. [...]
> 
> I remember a while back one of the presenters at the local 
> SAE chapter meeting mentioned that storing the braking energy 
> as compressed air achieves up to 70% efficiency, compared to 
> only 20% for batteries. I do not recall the reason why 
> hybrids are still using batteries. Safety? Difficult to 
> achieve smooth acceleration?
> 
> Best regards,
> 
> Vitaliy 


Energy density.

Battery don't hold much power, but bottles of air contain even less.

Tony

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