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I think the Scangauge calculates fuel used from the MAF signal. If the MAF is failing, the engine will go into some sort of open loop mode while the Scangauge is working from a garbage MAF signal. That would explain both the trouble code and the goofy Scangauge reading.
You can expect the measured tank mileage to decrease if the engine is in open loop mode.
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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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