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My engine stays closed loop at WOT up to about 4000 RPM, so no rich mixture penalty at normal speeds.
Throttle position does not matter, what counts is manifold pressure (or manifold vacuum if you look at it the other way). Keep that as steady as possible. With practice, you learn to enter the bottom of the hill 1 or 2 MPH faster and top the hill 5 MPH or so slower. All while minimizing the change in intake manifold pressure. The result, in addition to improved MPG, is that your driving gets smoother and your passengers all fall asleep so you have nobody to talk to.
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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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