Current median skyactiv fuel economy around 27 mpg so a 20% increase gets you to 33 mpg. Good for Mazda but not world changing compared to hybrids and EVs. Also, only a small fraction of the btu is gasoline gets converted to wheel turning energy compared to 85-90% of battery btu. UTexas looks to be ahead of Toyota in increasing EV battery storage density by 3X.
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