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Piston aircraft engines typically cruise at 75% power, while automobile engines typically cruise at 5% to 10% power. At 75% power, the exhaust is hot enough to get useful work from. At 10% power, it is not.
Those aircraft engines with the power recovery turbines were notorious for needing a lot of maintenance.
Exhaust heat recovery is the latest thing in large powerplant gas turbines. The best ones are up to 60% efficiency.
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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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