High efficiency ICE (exhaust heat recovery)

[markweatherill]

I had this idea once of getting some energy out of the engine coolant's 'waste' heat by running the coolant into an additional cylinder, letting it expand as steam, condensing it after.
Or running a steam turbine off it to drive the alternator.

[Dean in Milwaukee]

A simpler system could use a conventional turbo to generate power instead of presurizing the intake.
The conceptially simplest would be to have it run a generater and if you want to tap waste heat along with exhaust pressure add a recirculating water injection system right ahead of the turbo. This would use the waste heat to create more " turbo boost " making more power, but would also require a condensor to reclaim this water, making the system larger and more complicated.

A generator system of this type could likely handle all the cars electrical needs, and might even be able to handle electric driven a/c, at least at steady hwy speeds.