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Data from independent organisations suggests Hybrids don't actually prevent as much emissions on average over traditional ICE cars as thought in real-world use | Just Have A Think
Technology Connections also did a video on this.
The basic conclusions I got from it in terms of efficiency:
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Conventional hydrid cars are not all created equal, with parallel hybrids typically being more efficient than serial hybrids
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Plug in hybrids are frequently less efficient than a well designed conventional hybrid, if they are not charged regularly by electricity
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Both are very inefficient compared to battery electric vehicles by nature of engines being inherently inefficient