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Hybrids do this, but hybrids have a better system for storing electrical energy.
Back in the day, there was work being done to use mechanical flywheels for energy recovery storage - imagine a big carbon-fiber wrapped, magnetically suspended flywheel spinning in a vacuum at thousands of RPM that produces power during acceleration and stores power during deceleration. It's a really cool concept, but 50-100 pounds of exploding carbon fiber maglev flywheel is a big drag.
I maintain that the Boxster would make a cool electric conversion platform once 100HP in-hub electric motors become available and affordable.
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