Key context: thermodynamics dictates that heat engines waste a lot of energy.
Credit: Karin Kirk
this post was submitted on 11 Nov 2024
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It's even worse when you take a bunch of the small percentage of energy the heat engine successfully turns into motion and then use it to heat up the brake discs.
Being able to recapture kinetic energy into a battery and reuse it later helps overall efficiency a lot.
Plug-in hybrid? Aren't they worse than both, because of the weight of motor and battery?
You also get to use a smaller lighter ICE motor which is augmented by nearly instantaneous electric power. My favorite car was a Prius C which is no sportscar, but feels much zippier than you would expect for getting 50 mpg.