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I just finished reading my copy of the book. Excellent job. This book could be more accurately titled "The Ecomodders Aerodynamic Bible".
I now know why my wheel covers did not affect the gas mileage.
My air dam also did not affect the gas mileage. I now know how to find out why, and then what to do about it. Full disclosure: The old air dam was made of brittle plastic and was in several pieces held together with Gorilla tape. There should be room for drag reduction.
My 100% grille block has never caused overheating, even on a long upgrade at 91 deg F with the AC running. I think I should look further into that also. There's room to further reduce drag.
He did miss one thing. The PNGV - Partnership for a New Generation of Vehicles, where GM, Ford, and Chrysler built full size cars capable of 72 to 80 MPG.
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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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