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