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The MPG hit does not need to be as dramatic as it is but REX models
Tend to skimp on the Rex in one way or another.
In the Gen I Volt they used the cheapest motor they had in the stable and tuned it
On the BMW they only cared about weight and skipped efficiency
On the Ford they did a poor job of packaging the drivetrain/battery and again lost efficiency
I think if we start getting into ultralight materials coupled with a more energy dense battery we will likely get to where there is no edge for the straight hybrid model
Further, every hybrid on the road could have a plug, use the same battery and gain 3-6 city miles of range.
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