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...I did similar data collection with my 2009 Vibe while driving to (6AM)/from(6PM) work, and got similar results: (1) AM temps colder than PM temps; (2) AM winds less than PM winds; (3) AM mpg's lower than PM mpgs; (4) AM slope UP-hill and PM slope DOWN-hill (2300' to 2600' over 26 miles).
...however, the BIGGEST change was WIND & DIRECTION. In AM winds were almost always none, but in PM they were always higher, but often in diametric different directions--sometimes WITH my direction, sometimes AGAINST my direction.
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