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80% of your gas money goes out the tailpipe
(slrpnk.net)
Key context: thermodynamics dictates that heat engines waste a lot of energy.
Credit: Karin Kirk
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.