My brother has an aero topper on his F250 (photos in my profile album). He put four eyebolts in the topper for tying down a short canoe. The canoe sets upside down on the slant topper. With nearly zero airflow through and past the open side of the canoe, his mileage hit is too small to measure.
And here's a writeup on the mods to my my truck, along with mileage results: http://ecomodder.com/forum/showthrea...yon-17070.html
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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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