That video talks about how VW get 20% more economy from their turbo exhaust.
I'd just rig it up and get it working to prove the 'experts' wrong. I think this whole field of turbo-charging for efficiency is a completely new area.
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2003 Renault Scenic - 30% more power with no loss in fuel economy.
1991 Toyota GT4 - more economical before ST215W engine-swap.
previous: Water-Injected Mitsubishi ~33% improved.
future - probably a Prius 
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