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I don't think so. I am not seeing any pattern emerge that would suggest seasonal temperature changes are effecting the gas mileage.
On one hand, denser air would suggest more air drag (less MPG), but colder air might mean better combustion. Do these offset each other somewhat? I have no idea.
However, since I saw a drastic and immediate difference in the ScanGauge reading after installing Air Tabs, that pretty much rules out seasonal temperature changes.
I believe that the shape of the rear of the RV matters. Perhaps not as much as the front, but it has to contribute to the drag of the box going down the road, and that affects fuel mileage. Whether or not the Air Tabs sufficiently change the shape will reveal itself especially during longer term testing.
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