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I've thought about these things for a long time since I came up with a similar idea when I was a EE student about 30 years ago. The tests show how much energy is being recovered and I assume that means into the battery. I don't see anywhere that the testing includes the effect of what would almost certainly be a substantially heavier system than standard shock absorber system. Or maybe I'm wrong. Maybe Audi has been able to make a light weight generator/charger/battery system.
The part about additional mpg improvement in an already more efficient vehicle is probably wrong since the more efficient vehicle is likely that way due to aerodynamic properties which would over ride the linear function that the articles author is attempting to use. Just my thoughts.
I really would like to see this work, but I'm not sure the added complexity(and cost) makes it worthwhile.
JJ
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