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I'd be real cautious about reducing water pump flow. The water circulation is used not only to cool the engine, but also equalize temperatures throughout the engine.
Pump power is proportional to RPM cubed, so is low at the low RPM's that we drive at. I don't know enough about engines to know if reducing flow at low RPM will lead to hot spot problems.
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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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