Is Google tampering with Adsense stats?

[Gizzi]

I own a few blogs running Adsense. In the beginning of the month my CPM is around $1.60 - $1.80 but once I reached about $10 the CPM goes down to around $1.00, then when my balance reaches $20 it goes down again to around $0.80, at $30 it had fallen to $0.40.

Then, the stats in Adsense aren't correct, not even close! I receive about 4000 pageview a day with all blogs running at least 2 adsense ads. However, adsense stats only register about 800 views a day...

VERY SUSPICIOUS!! Anyone knows more?

PS, all my other ad networks (2 in total DO give the correct number of views, only adsense is the odd one with MUCH lower registered views...

[Jake]

Accurate or not, it's more likely that their fake traffic detection algorithms is causing a percentage of the views and clicks to be ignored. Your tracking probably has different bounce rate criteria.