>>>Sounds good. I suppose though you have to brake a lot to build up potential, thus needing to replace the brakes more often, with the power it requires to make new brakes. Ain't no such thing as a free lunch :-)
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>>Ah just look it up - it doesn't use brakes for breaking as long as it can use the momentum to turn the electric motor, using it as a generator. So it's not the heat that's transformed, it's the dynamic energy which is _not_ transformed into heat, but back into electricity. So it's still not a free lunch (had to use some gasoline at some point to produce that momentum); it's rather the part of the lunch which was previously thrown away.
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>So I aught to force my kids to eat the crusts off their sandwiches to get them ready for the cars of tommorrow?
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>Anyway, look it up where? I see no ref's.
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>I was thinking of the car's momentum to drive a generator but then I thought, well cars have been doing that for decades - how come that hasn't been utilised? Then I figured that for some electro-mechanical reason that wasn't feasible/efficient enough.

There are also experimental vehicles, larger one I believe (busses, trucks) with a flywheel designed to assist with acceleration after stopping/slowing.

While there's no "free lunch" I believe you caught it right when you said recouping bits that used to go into the garbage. That's **almost** a 'free lunch'... at least until it's standard fare on all vehicles.