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I found an absolute pressure gauge in McMaster-Carr for over $400. A little pricey.
Since the OP is close enough to sea level, he might be better off to paint new numbers on a standard vacuum gauge. Add an altimeter and do a mental conversion if ever drive in the mountains.
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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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