Aero would have been a small factor: peak speed in the coastdown testing was 22 km/h (13.7 mph).
The average speed would have been significantly less (but I didn't measure that).
EDIT: and yes, the ambient temp was probably also going up during the testing. Looks like 1 degree C change, or from 73.4 to 75 F. Though the temp of the asphalt was probably going up faster than the air temp.
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