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The battery tech isn't what was valuable to GM, as that changes continuously. The valuable tech was the hybrid drivetrain implementation.
I agree that the tech should have gone into larger vehicles. Small vehicles are already efficient by virtue of being small. It's the larger ones that stand to benefit the most. Why they are the last to get hybrid tech is beyond me.
Perhaps people who buy sedans are mindful of their fuel expenses, while people who buy more expensive larger vehicles don't care what they are spending on fuel.
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