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If you use good components, it takes about 4 hp to the compressor to get 1 hp out of an air motor. Home made compressors and motors will do far worse.
It's because of the laws of thermodynamics, specifically adiabatic vs isothermal compression and expansion.
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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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