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These topics are well covered in GIS StackExchange:
http://gis.stackexchange.com/questions/95133/what-is-the-ruler-accuracy-in-google-earth-pro
This is Google's stance:
https://productforums.google.com/forum/?hl=en#!category-topic/earth/imagery--data--layers/6-4HUc-bWqk
Basically, they warrant nothing.
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