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Old 07-29-2012, 09:33 PM   #3 (permalink)
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Join Date: Feb 2011
Location: Phillips, WI
Posts: 966

Nameless - '06 GMC Canyon
90 day: 33.76 mpg (US)
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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.
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.
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