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We used to have a 1995 Dodge Neon. That car averaged 41 MPG highway in the summer at 60 MPH. I once got the exact same mileage at 80 MPH. At the time, I was not paying attention to the weather, but I do remember that it was a hot summer day (no AC in the car). There may have been a tailwind.
The engine in the Neon had fixed camshaft timing, so was more efficient at higher speeds.
Anyway, better mileage at higher speeds is believable, but unlikely. Temperature and wind have a large effect on mileage, and you need to include them in your testing.
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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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