Quote:
Originally Posted by hulkrogan
A car engine is about 20% efficient at best. Coal plants are slightly over 30% efficient, so over 1.5 times more efficient.
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Which means in order to be just as efficient as a current car engine, the conversion process of combustion energy to electricity to compression of air to mechanical force must be 66% or better in order to be as green as the current process at a really simplistic level (which is still pretty insane). Of course, this leaves out the difference between coal and heavy gasoline (which, from a green perspective, coal is generally worse in).
At least it's more attainable than the ~100% needed with the original number.