I leave my heater blower speed on position 1 most all winter, at which speed it draws about 40 watts. That's not enough power draw to measureably affect my MPG. That blower speed is good down to about 0 deg F.
Occasionally, in mild weather, I can shut the blower off and let ram air do its thing.
I pull the AC compressor fuse whenever I don't need AC to allow me to use defrost without running the AC.
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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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