I use ecomodder's garage for my log, of course! If there are any additional variables I write them into the notes field.
As you mention, its hard to get consistency. There is even a fair amount of variance in day to day commutes if you track things daily going to and from the exact same place. That is about the most consistent scenario too! However, 9 mpg difference is quite drastic. Can you describe your example trip a bit further?
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