Marshall Brain's Blog

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It is an interesting idea -- trying to reclaim all of the wasted heat in gasoline engine and use it to generate additional power in the engine:

BMW's Hybrid Vision: Gasoline and Steam

Two things: 1) It is interesting how complex the system is, and 2) it is interesting that it only recovers 15% more power. Given that something like 80% of gasoline's power is wasted as heat, it seems like you should be able to reclaim more than 15%. But obviously not.