My rolling resistance goes way up in winter. Because of that, aero improvements won't do a lot to improve winter mileage. I have not tried to track down where the cold weather rolling resistance is coming from. Something about crawling around underneath in below zero temperatures is just not appealing to me.
In summer, my MPG drops about 20% from 55 to 65 MPH. I've never run at 65 long enough to get good numbers.
I do have a spare front bumper that I could use to build a conveyor belt air dam. I'm trying to decide if I should go down as far as the front cross member and A-arms, or as far as the transmission cross member.
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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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