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Mine consistently reads about 2 mpg higher than my actual gas mileage, but I always use the same pump right by my house, and my drive is generally the same. Pumps definitely have different fill rates, so that could be an issue.
There might have been a tail wind on your way down, and a head wind on the way back. It makes a difference, even if the wind is light. The day I tested my belly pan there was about a 15 mph wind, so the half with a tail wind I was averaging way over 100 mpg at 60 mph, and on the way back with a head wind I was barely averaging 75 mpg.
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