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I did the sums when I bought my Prius, I was considering doing a PHEV conversion.
Turns out it would cost more to run on batteries than it does on ICE, and that's not accounting for the converison cost and eventual battery replacement.
On the OEM front a G2 Prius also works out cheaper to fuel then a brand new Leaf. A G4 just kicks it in the nads.
Most cars sold today have idle stop, so they're already silent at traffic lights, and at higher speeds, it's wind and road noise that predominates. For about $100/year you can offset a V8's CO2 emissions.
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