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In my particular case, an underdrive pulley would not work well. I already run at low enough RPM that the alternator voltage occasionally drops. Also, when the RPM gets that low, the water pump is not moving enough coolant to keep the engine at even temperature. About 1/3 of my miles are at 1000 RPM or less.
I don't need more power. I get up to speed on a short entrance ramp while shifting at less than 4000 RPM.
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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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