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For those living less than about 1000 feet above sea level:
0 inches vacuum is about 14 PSI MAP
5 inches about 11.5 PSI
10 inches about 9 PSI
15 inches about 7 PSI
20 inches about 5 PSI
So you are right in the range of "forget P&G", and use DWL and DWB.
The exact conversion is 29.92 inches to 0 PSI at sea level, decreasing 1 inch per thousand feet. And 0 inches to 14.7 PSI. That's why I said "about" in the above table.
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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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