After submitting a ticket (had to buy silver suppport package), the problem was analyzed by google and it was indeed a bug in the app engine which caused discrepancies between real bandwidth usage from the logs and the billed values in the dashboard. It's solved now.
Beside this, I gave also CloudFlare a try and it seems to be a great service. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/google-appengine. For more options, visit https://groups.google.com/groups/opt_out.
