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Hi,
I think that serial hybrids are simpler (and lighter?), and therefore they can be more efficient in all situations. And they are definitely more efficient in "city" driving. And if there is some sort of CVT transmission, then serial hybrids will do pretty darn well at highway speeds, too.
If you think about it, the amperage an electric motor uses is kinda' like an ICE's displacement, right? So, an electric motor has a variable displacement; whereas having an ICE with variable displacement is a tougher issue.
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