Why can’t we use the heat from combustion to make cars more efficient?

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Can we use the heat to boil water to turn a turbine? Or would the water never cool enough to be used again?

What about using the heat to create pressure and then releasing the pressure to help move the fly wheel?

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Mercedes M278 4.0 Liter Twin Turbos consume way less fuel and generates way more power than the older M273 engine 5.5 liter normally aspirated V8. As someone else pointed out turbocharging does use hot exhaust energy to improve efficiency though without generating electricity. Direct Inject plays a large part in the improved efficiency along with turbocharging and automatic transmission improvements.

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