I have the same problem as everyone else. I have the Telus version which is the same as T-Mobile, the only difference is that we are on 2.3.5.
My problem on the other hand is not high battery usage from Android system, it's from the screen !!
As you can see in thr picture, Android system is at 11%, but the screen is at 35%. I tested different brightness options and with all of them (Auto, Minimum and 50%) I get the same results.
Can anyone help me with my problem ? Maybe tell me to change some settings in my phone ? .. Im on stock and haven't rooted my phone yet.
