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Converting energy types is inefficient.
In my estimation, plug-in hybrids is an excellent bridge technology. My dinky 15 mile range plug-in Prius was doing about 70% of miles on electrons, and not lugging around a larger battery than necessary. I'd say this was a suboptimal size, but the RAV4 Prime is getting pretty darn close to optimal.
I understand the desire to eliminate the complexity and cost of integrating 2 powertrains, but the benefits seem to outweigh the negatives at the moment.
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